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<head>
<meta charset=utf-8>
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@ -14,8 +14,7 @@
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<title>Use Queries to Detect Duplicate Records | alguidelines.dev - Business Central Design Patterns</title>
<meta name=description content="Originally by Abshishek Ghosh and Bogdan Sturzoiu at Microsoft Development Center Copenhagen
<title>Use Queries to Detect Duplicate Records | alguidelines.dev - Business Central Design Patterns</title><meta name=description content="Originally by Abshishek Ghosh and Bogdan Sturzoiu at Microsoft Development Center Copenhagen
Abstract
This pattern uses queries to create an efficient …">
<meta property="og:title" content="Use Queries to Detect Duplicate Records">
@ -41,8 +40,7 @@ Description Duplicate detection has several requirements in Microsoft Dynamics N
<link href=/scss/main.min.84a617ff0c0265eb62b5cd2929c572f4ed37dc4907d0cf068be4eb2974f6d60f.css rel=stylesheet integrity>
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@ -54,36 +52,24 @@ Description Duplicate detection has several requirements in Microsoft Dynamics N
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<a href=/docs/ title="AL Guidelines" class="align-left pl-0 td-sidebar-link td-sidebar-link__section tree-root" id=m-docs><span>Docs</span></a>
@ -101,9 +87,9 @@ Description Duplicate detection has several requirements in Microsoft Dynamics N
<a href=/docs/patterns/facade-pattern/ class="align-left pl-0 td-sidebar-link td-sidebar-link__page" id=m-docspatternsfacade-pattern><span>Façade</span></a>
</li><li class="td-sidebar-nav__section-title td-sidebar-nav__section without-child collapse" id=m-docspatternsgeneric-method-pattern-li>
<a href=/docs/patterns/generic-method-pattern/ class="align-left pl-0 td-sidebar-link td-sidebar-link__page" id=m-docspatternsgeneric-method-pattern><span>Generic Method</span></a>
</li>
</ul>
</li><li class="td-sidebar-nav__section-title td-sidebar-nav__section with-child" id=m-docsbestpractices-li>
</li><li class="td-sidebar-nav__section-title td-sidebar-nav__section without-child collapse" id=m-docspatternsno-series-li>
<a href=/docs/patterns/no-series/ class="align-left pl-0 td-sidebar-link td-sidebar-link__page" id=m-docspatternsno-series><span>No. Series</span></a>
</li></ul></li><li class="td-sidebar-nav__section-title td-sidebar-nav__section with-child" id=m-docsbestpractices-li>
<a href=/docs/bestpractices/ class="align-left pl-0 td-sidebar-link td-sidebar-link__section" id=m-docsbestpractices><span>Best Practices</span></a>
<ul class="ul-2 foldable">
<li class="td-sidebar-nav__section-title td-sidebar-nav__section without-child collapse" id=m-docsbestpracticesapi-page-li>
@ -150,9 +136,7 @@ Description Duplicate detection has several requirements in Microsoft Dynamics N
<a href=/docs/bestpractices/variable-naming/ class="align-left pl-0 td-sidebar-link td-sidebar-link__page" id=m-docsbestpracticesvariable-naming><span>Variable Naming</span></a>
</li><li class="td-sidebar-nav__section-title td-sidebar-nav__section without-child collapse" id=m-docsbestpracticesvariables-declarations-order-li>
<a href=/docs/bestpractices/variables-declarations-order/ class="align-left pl-0 td-sidebar-link td-sidebar-link__page" id=m-docsbestpracticesvariables-declarations-order><span>Variables Declarations Order</span></a>
</li>
</ul>
</li><li class="td-sidebar-nav__section-title td-sidebar-nav__section with-child active-path" id=m-docsnavpatterns-li>
</li></ul></li><li class="td-sidebar-nav__section-title td-sidebar-nav__section with-child active-path" id=m-docsnavpatterns-li>
<a href=/docs/navpatterns/ class="align-left pl-0 td-sidebar-link td-sidebar-link__section" id=m-docsnavpatterns><span>NAV Patterns Archive</span></a>
<ul class="ul-2 foldable">
<li class="td-sidebar-nav__section-title td-sidebar-nav__section with-child active-path" id=m-docsnavpatternspatterns-li>
@ -167,9 +151,7 @@ Description Duplicate detection has several requirements in Microsoft Dynamics N
<ul class="ul-4 foldable">
<li class="td-sidebar-nav__section-title td-sidebar-nav__section without-child collapse" id=m-docsnavpatternspatternsblocked-entitydata-driven-blocked-entity-li>
<a href=/docs/navpatterns/patterns/blocked-entity/data-driven-blocked-entity/ class="align-left pl-0 td-sidebar-link td-sidebar-link__page" id=m-docsnavpatternspatternsblocked-entitydata-driven-blocked-entity><span>Data Driven Blocked Entity</span></a>
</li>
</ul>
</li><li class="td-sidebar-nav__section-title td-sidebar-nav__section without-child" id=m-docsnavpatternspatternscached-web-service-calls-li>
</li></ul></li><li class="td-sidebar-nav__section-title td-sidebar-nav__section without-child" id=m-docsnavpatternspatternscached-web-service-calls-li>
<a href=/docs/navpatterns/patterns/cached-web-service-calls/ class="align-left pl-0 td-sidebar-link td-sidebar-link__page" id=m-docsnavpatternspatternscached-web-service-calls><span>Cached Web Server Calls</span></a>
</li><li class="td-sidebar-nav__section-title td-sidebar-nav__section without-child" id=m-docsnavpatternspatternsconditional-cascading-update-li>
<a href=/docs/navpatterns/patterns/conditional-cascading-update/ class="align-left pl-0 td-sidebar-link td-sidebar-link__page" id=m-docsnavpatternspatternsconditional-cascading-update><span>Conditional Cascading Update</span></a>
@ -224,9 +206,7 @@ Description Duplicate detection has several requirements in Microsoft Dynamics N
<ul class="ul-4 foldable">
<li class="td-sidebar-nav__section-title td-sidebar-nav__section without-child collapse" id=m-docsnavpatternspatternsnet-exception-handling-in-caltryfunction-net-exception-handling-in-cal-li>
<a href=/docs/navpatterns/patterns/net-exception-handling-in-cal/tryfunction-net-exception-handling-in-cal/ class="align-left pl-0 td-sidebar-link td-sidebar-link__page" id=m-docsnavpatternspatternsnet-exception-handling-in-caltryfunction-net-exception-handling-in-cal><span>TryFunction NET Exception Handling in CAL</span></a>
</li>
</ul>
</li><li class="td-sidebar-nav__section-title td-sidebar-nav__section without-child" id=m-docsnavpatternspatternsno-series-li>
</li></ul></li><li class="td-sidebar-nav__section-title td-sidebar-nav__section without-child" id=m-docsnavpatternspatternsno-series-li>
<a href=/docs/navpatterns/patterns/no-series/ class="align-left pl-0 td-sidebar-link td-sidebar-link__page" id=m-docsnavpatternspatternsno-series><span>No Series</span></a>
</li><li class="td-sidebar-nav__section-title td-sidebar-nav__section with-child" id=m-docsnavpatternspatternsnotifications-li>
<a href=/docs/navpatterns/patterns/notifications/ class="align-left pl-0 td-sidebar-link td-sidebar-link__section" id=m-docsnavpatternspatternsnotifications><span>Notifications</span></a>
@ -235,9 +215,7 @@ Description Duplicate detection has several requirements in Microsoft Dynamics N
<a href=/docs/navpatterns/patterns/notifications/in-context-notifications/ class="align-left pl-0 td-sidebar-link td-sidebar-link__page" id=m-docsnavpatternspatternsnotificationsin-context-notifications><span>In-context Notifications</span></a>
</li><li class="td-sidebar-nav__section-title td-sidebar-nav__section without-child collapse" id=m-docsnavpatternspatternsnotificationsnotification-lifecycle-management-pattern-li>
<a href=/docs/navpatterns/patterns/notifications/notification-lifecycle-management-pattern/ class="align-left pl-0 td-sidebar-link td-sidebar-link__page" id=m-docsnavpatternspatternsnotificationsnotification-lifecycle-management-pattern><span>Notification Lifecycle Management Pattern</span></a>
</li>
</ul>
</li><li class="td-sidebar-nav__section-title td-sidebar-nav__section without-child" id=m-docsnavpatternspatternsobserver-li>
</li></ul></li><li class="td-sidebar-nav__section-title td-sidebar-nav__section without-child" id=m-docsnavpatternspatternsobserver-li>
<a href=/docs/navpatterns/patterns/observer/ class="align-left pl-0 td-sidebar-link td-sidebar-link__page" id=m-docsnavpatternspatternsobserver><span>Observer</span></a>
</li><li class="td-sidebar-nav__section-title td-sidebar-nav__section without-child" id=m-docsnavpatternspatternsposting-routine-select-behavior-li>
<a href=/docs/navpatterns/patterns/posting-routine-select-behavior/ class="align-left pl-0 td-sidebar-link td-sidebar-link__page" id=m-docsnavpatternspatternsposting-routine-select-behavior><span>Posting Routine - Select Behavior</span></a>
@ -252,9 +230,7 @@ Description Duplicate detection has several requirements in Microsoft Dynamics N
<a href=/docs/navpatterns/patterns/queries/use-queries-to-detect-duplicate-records/ class="align-left pl-0 active td-sidebar-link td-sidebar-link__page" id=m-docsnavpatternspatternsqueriesuse-queries-to-detect-duplicate-records><span class=td-sidebar-nav-active-item>Use Queries to Detect Duplicate Records</span></a>
</li><li class="td-sidebar-nav__section-title td-sidebar-nav__section without-child" id=m-docsnavpatternspatternsqueriesuse-queries-to-replace-nested-loops-li>
<a href=/docs/navpatterns/patterns/queries/use-queries-to-replace-nested-loops/ class="align-left pl-0 td-sidebar-link td-sidebar-link__page" id=m-docsnavpatternspatternsqueriesuse-queries-to-replace-nested-loops><span>Use Queries to Replace Nested Loops</span></a>
</li>
</ul>
</li><li class="td-sidebar-nav__section-title td-sidebar-nav__section without-child" id=m-docsnavpatternspatternsread-once-initialization-and-validation-li>
</li></ul></li><li class="td-sidebar-nav__section-title td-sidebar-nav__section without-child" id=m-docsnavpatternspatternsread-once-initialization-and-validation-li>
<a href=/docs/navpatterns/patterns/read-once-initialization-and-validation/ class="align-left pl-0 td-sidebar-link td-sidebar-link__page" id=m-docsnavpatternspatternsread-once-initialization-and-validation><span>Read-once Initialization and Validation</span></a>
</li><li class="td-sidebar-nav__section-title td-sidebar-nav__section without-child" id=m-docsnavpatternspatternsreleased-entity-li>
<a href=/docs/navpatterns/patterns/released-entity/ class="align-left pl-0 td-sidebar-link td-sidebar-link__page" id=m-docsnavpatternspatternsreleased-entity><span>Released Entity</span></a>
@ -273,9 +249,7 @@ Description Duplicate detection has several requirements in Microsoft Dynamics N
<a href=/docs/navpatterns/patterns/security/4-masked-text/ class="align-left pl-0 td-sidebar-link td-sidebar-link__page" id=m-docsnavpatternspatternssecurity4-masked-text><span>Masked Text</span></a>
</li><li class="td-sidebar-nav__section-title td-sidebar-nav__section without-child collapse" id=m-docsnavpatternspatternssecurity5-ssl-in-nav-li>
<a href=/docs/navpatterns/patterns/security/5-ssl-in-nav/ class="align-left pl-0 td-sidebar-link td-sidebar-link__page" id=m-docsnavpatternspatternssecurity5-ssl-in-nav><span>SSL in NAV</span></a>
</li>
</ul>
</li><li class="td-sidebar-nav__section-title td-sidebar-nav__section without-child" id=m-docsnavpatternspatternssetup-specificity-fallback-li>
</li></ul></li><li class="td-sidebar-nav__section-title td-sidebar-nav__section without-child" id=m-docsnavpatternspatternssetup-specificity-fallback-li>
<a href=/docs/navpatterns/patterns/setup-specificity-fallback/ class="align-left pl-0 td-sidebar-link td-sidebar-link__page" id=m-docsnavpatternspatternssetup-specificity-fallback><span>Setup Specificity Fallback</span></a>
</li><li class="td-sidebar-nav__section-title td-sidebar-nav__section without-child" id=m-docsnavpatternspatternssilent-file-upload-and-download-li>
<a href=/docs/navpatterns/patterns/silent-file-upload-and-download/ class="align-left pl-0 td-sidebar-link td-sidebar-link__page" id=m-docsnavpatternspatternssilent-file-upload-and-download><span>Silent File Upload and Download</span></a>
@ -291,11 +265,7 @@ Description Duplicate detection has several requirements in Microsoft Dynamics N
<a href=/docs/navpatterns/patterns/singleton/singleton-table/cue-table/ class="align-left pl-0 td-sidebar-link td-sidebar-link__page" id=m-docsnavpatternspatternssingletonsingleton-tablecue-table><span>Cue Table</span></a>
</li><li class="td-sidebar-nav__section-title td-sidebar-nav__section without-child collapse" id=m-docsnavpatternspatternssingletonsingleton-tablesetup-table-li>
<a href=/docs/navpatterns/patterns/singleton/singleton-table/setup-table/ class="align-left pl-0 td-sidebar-link td-sidebar-link__page" id=m-docsnavpatternspatternssingletonsingleton-tablesetup-table><span>Setup Table</span></a>
</li>
</ul>
</li>
</ul>
</li><li class="td-sidebar-nav__section-title td-sidebar-nav__section without-child" id=m-docsnavpatternspatternsstandard-journal-li>
</li></ul></li></ul></li><li class="td-sidebar-nav__section-title td-sidebar-nav__section without-child" id=m-docsnavpatternspatternsstandard-journal-li>
<a href=/docs/navpatterns/patterns/standard-journal/ class="align-left pl-0 td-sidebar-link td-sidebar-link__page" id=m-docsnavpatternspatternsstandard-journal><span>Standard Journal</span></a>
</li><li class="td-sidebar-nav__section-title td-sidebar-nav__section without-child" id=m-docsnavpatternspatternstemporary-dataset-report-li>
<a href=/docs/navpatterns/patterns/temporary-dataset-report/ class="align-left pl-0 td-sidebar-link td-sidebar-link__page" id=m-docsnavpatternspatternstemporary-dataset-report><span>Temporary Dataset Report</span></a>
@ -305,18 +275,14 @@ Description Duplicate detection has several requirements in Microsoft Dynamics N
<a href=/docs/navpatterns/patterns/transfer-custom-fields/ class="align-left pl-0 td-sidebar-link td-sidebar-link__page" id=m-docsnavpatternspatternstransfer-custom-fields><span>Transfer Custom Fields</span></a>
</li><li class="td-sidebar-nav__section-title td-sidebar-nav__section without-child" id=m-docsnavpatternspatternsvariant-facade-li>
<a href=/docs/navpatterns/patterns/variant-facade/ class="align-left pl-0 td-sidebar-link td-sidebar-link__page" id=m-docsnavpatternspatternsvariant-facade><span>Variant Facade</span></a>
</li>
</ul>
</li><li class="td-sidebar-nav__section-title td-sidebar-nav__section with-child" id=m-docsnavpatterns2-anti-patterns-li>
</li></ul></li><li class="td-sidebar-nav__section-title td-sidebar-nav__section with-child" id=m-docsnavpatterns2-anti-patterns-li>
<a href=/docs/navpatterns/2-anti-patterns/ class="align-left pl-0 td-sidebar-link td-sidebar-link__section" id=m-docsnavpatterns2-anti-patterns><span>2. Anti-Patterns</span></a>
<ul class="ul-3 foldable">
<li class="td-sidebar-nav__section-title td-sidebar-nav__section without-child collapse" id=m-docsnavpatterns2-anti-patternsnav-upgrade-li>
<a href=/docs/navpatterns/2-anti-patterns/nav-upgrade/ class="align-left pl-0 td-sidebar-link td-sidebar-link__page" id=m-docsnavpatterns2-anti-patternsnav-upgrade><span>Nav Upgrade</span></a>
</li><li class="td-sidebar-nav__section-title td-sidebar-nav__section without-child collapse" id=m-docsnavpatterns2-anti-patternsreusable-bugs-li>
<a href=/docs/navpatterns/2-anti-patterns/reusable-bugs/ class="align-left pl-0 td-sidebar-link td-sidebar-link__page" id=m-docsnavpatterns2-anti-patternsreusable-bugs><span>Reusable Bugs</span></a>
</li>
</ul>
</li><li class="td-sidebar-nav__section-title td-sidebar-nav__section with-child" id=m-docsnavpatterns3-cal-coding-guidelines-li>
</li></ul></li><li class="td-sidebar-nav__section-title td-sidebar-nav__section with-child" id=m-docsnavpatterns3-cal-coding-guidelines-li>
<a href=/docs/navpatterns/3-cal-coding-guidelines/ class="align-left pl-0 td-sidebar-link td-sidebar-link__section" id=m-docsnavpatterns3-cal-coding-guidelines><span>3. CAL Coding Guidelines</span></a>
<ul class="ul-3 foldable">
<li class="td-sidebar-nav__section-title td-sidebar-nav__section with-child collapse" id=m-docsnavpatterns3-cal-coding-guidelinesdesign-li>
@ -350,18 +316,14 @@ Description Duplicate detection has several requirements in Microsoft Dynamics N
<a href=/docs/navpatterns/3-cal-coding-guidelines/design/variable-capacity-mismatch/ class="align-left pl-0 td-sidebar-link td-sidebar-link__page" id=m-docsnavpatterns3-cal-coding-guidelinesdesignvariable-capacity-mismatch><span>Variable Capacity Mismatch</span></a>
</li><li class="td-sidebar-nav__section-title td-sidebar-nav__section without-child collapse" id=m-docsnavpatterns3-cal-coding-guidelinesdesignwith-scope-name-collision-li>
<a href=/docs/navpatterns/3-cal-coding-guidelines/design/with-scope-name-collision/ class="align-left pl-0 td-sidebar-link td-sidebar-link__page" id=m-docsnavpatterns3-cal-coding-guidelinesdesignwith-scope-name-collision><span>WITH Scope Name Collision</span></a>
</li>
</ul>
</li><li class="td-sidebar-nav__section-title td-sidebar-nav__section without-child collapse" id=m-docsnavpatterns3-cal-coding-guidelinesinternally-used-dot-net-types-li>
</li></ul></li><li class="td-sidebar-nav__section-title td-sidebar-nav__section without-child collapse" id=m-docsnavpatterns3-cal-coding-guidelinesinternally-used-dot-net-types-li>
<a href=/docs/navpatterns/3-cal-coding-guidelines/internally-used-dot-net-types/ class="align-left pl-0 td-sidebar-link td-sidebar-link__page" id=m-docsnavpatterns3-cal-coding-guidelinesinternally-used-dot-net-types><span>Internally used DotNet Types</span></a>
</li><li class="td-sidebar-nav__section-title td-sidebar-nav__section with-child collapse" id=m-docsnavpatterns3-cal-coding-guidelinesinternationalization-li>
<a href=/docs/navpatterns/3-cal-coding-guidelines/internationalization/ class="align-left pl-0 td-sidebar-link td-sidebar-link__section" id=m-docsnavpatterns3-cal-coding-guidelinesinternationalization><span>Internationalization</span></a>
<ul class="ul-4 foldable">
<li class="td-sidebar-nav__section-title td-sidebar-nav__section without-child collapse" id=m-docsnavpatterns3-cal-coding-guidelinesinternationalizationusing-calcdate-li>
<a href=/docs/navpatterns/3-cal-coding-guidelines/internationalization/using-calcdate/ class="align-left pl-0 td-sidebar-link td-sidebar-link__page" id=m-docsnavpatterns3-cal-coding-guidelinesinternationalizationusing-calcdate><span>Using Calcdate</span></a>
</li>
</ul>
</li><li class="td-sidebar-nav__section-title td-sidebar-nav__section with-child collapse" id=m-docsnavpatterns3-cal-coding-guidelineslocalizability-li>
</li></ul></li><li class="td-sidebar-nav__section-title td-sidebar-nav__section with-child collapse" id=m-docsnavpatterns3-cal-coding-guidelineslocalizability-li>
<a href=/docs/navpatterns/3-cal-coding-guidelines/localizability/ class="align-left pl-0 td-sidebar-link td-sidebar-link__section" id=m-docsnavpatterns3-cal-coding-guidelineslocalizability><span>Localizability</span></a>
<ul class="ul-4 foldable">
<li class="td-sidebar-nav__section-title td-sidebar-nav__section without-child collapse" id=m-docsnavpatterns3-cal-coding-guidelineslocalizabilitycaptionml-for-system-tables-li>
@ -374,9 +336,7 @@ Description Duplicate detection has several requirements in Microsoft Dynamics N
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@ -443,9 +403,7 @@ Description Duplicate detection has several requirements in Microsoft Dynamics N
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@ -469,13 +423,9 @@ Description Duplicate detection has several requirements in Microsoft Dynamics N
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<h1>Use Queries to Detect Duplicate Records</h1>
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<p><em>Originally by Abshishek Ghosh and Bogdan Sturzoiu at Microsoft Development Center Copenhagen</em></p>
<h2 id=abstract>Abstract</h2>
<p>This pattern uses queries to create an efficient way to detect duplicate entries in a table. This is, for example, useful when trying to find out which customers or contacts have the same names, so we can merge them later.</p>
<h2 id=description>Description</h2>
<p>Duplicate detection has several requirements in Microsoft Dynamics NAV. One method to eliminate duplication is by defining the relevant field as the primary key. However, this method is not always practical either due to the size of the field or due to business requirements that dictate how duplicates are detected but not necessarily how they are eliminated. An example of this method is to detect contacts with the same name and take action to merge them if they are.</p>
<p>Before Dynamics NAV 2013, the only possibility was to iterate through the table in a loop and then create a sub-loop where another instance of the same table is filtered to check for duplicates. For example, to check for duplicate names in the Customer table, the code would look like this:</p>
<div class=highlight><pre tabindex=0 style=background-color:#f8f8f8;-moz-tab-size:4;-o-tab-size:4;tab-size:4><code class=language-al data-lang=al><span style=color:#204a87;font-weight:700>PROCEDURE</span><span style=color:#f8f8f8;text-decoration:underline> </span>HasDuplicateCustomers@<span style=color:#0000cf;font-weight:700>26</span><span style=color:#ce5c00;font-weight:700>() </span><span style=color:#000;font-weight:700>:</span><span style=color:#f8f8f8;text-decoration:underline> </span><span style=color:#204a87;font-weight:700>Boolean</span><span style=color:#000;font-weight:700>;</span><span style=color:#f8f8f8;text-decoration:underline>
</span><span style=color:#f8f8f8;text-decoration:underline></span><span style=color:#204a87;font-weight:700>VAR</span><span style=color:#f8f8f8;text-decoration:underline>
</span><span style=color:#f8f8f8;text-decoration:underline> </span>Customer@<span style=color:#0000cf;font-weight:700>1000</span><span style=color:#f8f8f8;text-decoration:underline> </span><span style=color:#000;font-weight:700>:</span><span style=color:#f8f8f8;text-decoration:underline> </span><span style=color:#204a87;font-weight:700>Record</span><span style=color:#f8f8f8;text-decoration:underline> </span><span style=color:#0000cf;font-weight:700>18</span><span style=color:#000;font-weight:700>;</span><span style=color:#f8f8f8;text-decoration:underline>
</span><span style=color:#f8f8f8;text-decoration:underline> </span>Customer2@<span style=color:#0000cf;font-weight:700>1001</span><span style=color:#f8f8f8;text-decoration:underline> </span><span style=color:#000;font-weight:700>:</span><span style=color:#f8f8f8;text-decoration:underline> </span><span style=color:#204a87;font-weight:700>Record</span><span style=color:#f8f8f8;text-decoration:underline> </span><span style=color:#0000cf;font-weight:700>18</span><span style=color:#000;font-weight:700>;</span><span style=color:#f8f8f8;text-decoration:underline>
</span><span style=color:#f8f8f8;text-decoration:underline></span><span style=color:#204a87;font-weight:700>BEGIN</span><span style=color:#f8f8f8;text-decoration:underline>
</span><span style=color:#f8f8f8;text-decoration:underline> </span><span style=color:#204a87;font-weight:700>IF</span><span style=color:#f8f8f8;text-decoration:underline> </span>Customer<span style=color:#ce5c00;font-weight:700>.</span>FINDSET<span style=color:#f8f8f8;text-decoration:underline> </span><span style=color:#204a87;font-weight:700>THEN</span><span style=color:#f8f8f8;text-decoration:underline>
</span><span style=color:#f8f8f8;text-decoration:underline> </span><span style=color:#204a87;font-weight:700>REPEAT</span><span style=color:#f8f8f8;text-decoration:underline>
</span><span style=color:#f8f8f8;text-decoration:underline> </span>Customer2<span style=color:#ce5c00;font-weight:700>.</span>SETRANGE<span style=color:#ce5c00;font-weight:700>(</span>Name<span style=color:#000;font-weight:700>,</span>Customer<span style=color:#ce5c00;font-weight:700>.</span>Name<span style=color:#ce5c00;font-weight:700>)</span><span style=color:#000;font-weight:700>;</span><span style=color:#f8f8f8;text-decoration:underline>
</span><span style=color:#f8f8f8;text-decoration:underline> </span><span style=color:#204a87;font-weight:700>IF</span><span style=color:#f8f8f8;text-decoration:underline> </span>Customer2<span style=color:#ce5c00;font-weight:700>.</span><span style=color:#204a87;font-weight:700>COUNT</span><span style=color:#f8f8f8;text-decoration:underline> </span>\&gt;<span style=color:#f8f8f8;text-decoration:underline> </span><span style=color:#0000cf;font-weight:700>1</span><span style=color:#f8f8f8;text-decoration:underline> </span><span style=color:#204a87;font-weight:700>THEN</span><span style=color:#f8f8f8;text-decoration:underline>
</span><span style=color:#f8f8f8;text-decoration:underline> </span><span style=color:#204a87;font-weight:700>EXIT</span><span style=color:#ce5c00;font-weight:700>(</span>TRUE<span style=color:#ce5c00;font-weight:700>)</span><span style=color:#000;font-weight:700>;</span><span style=color:#f8f8f8;text-decoration:underline>
</span><span style=color:#f8f8f8;text-decoration:underline> </span><span style=color:#204a87;font-weight:700>UNTIL</span><span style=color:#f8f8f8;text-decoration:underline> </span>Customer<span style=color:#ce5c00;font-weight:700>.</span>NEXT<span style=color:#f8f8f8;text-decoration:underline> </span>=<span style=color:#f8f8f8;text-decoration:underline> </span><span style=color:#0000cf;font-weight:700>0</span><span style=color:#000;font-weight:700>;</span><span style=color:#f8f8f8;text-decoration:underline>
</span><span style=color:#f8f8f8;text-decoration:underline> </span><span style=color:#204a87;font-weight:700>EXIT</span><span style=color:#ce5c00;font-weight:700>(</span>FALSE<span style=color:#ce5c00;font-weight:700>)</span><span style=color:#000;font-weight:700>;</span><span style=color:#f8f8f8;text-decoration:underline>
</span><span style=color:#f8f8f8;text-decoration:underline></span><span style=color:#204a87;font-weight:700>END</span><span style=color:#000;font-weight:700>;</span><span style=color:#f8f8f8;text-decoration:underline>
</span></code></pre></div><p>This code would involve setting filters on the <strong>Customer</strong> table as many times as there are records in the table. This is an expensive operation.</p>
<p>Starting with Dynamics NAV 2013, we can use queries to create a more efficient implementation of the same logic.</p>
<h2 id=usage>Usage</h2>
<p>The solution involves that you create a query to return duplicates, and then invoke it from a method that would test the value of the query to identify if duplicates were found.</p>
<p><strong>Step 1</strong> &ndash; <strong>Creating the Query</strong></p>
<ul>
<li>The query must be created with the table we want to search in as the dataitem.</li>
<li>The field we want to search for must be created as a grouped field.</li>
<li>Create a totaling field on the count, and add a filter for Count > 1. This ensures that only records with more than one instance of the field that we selected in the previous step are included in the query result.</li>
</ul>
<p>Continuing with our Customer Name example, here is how the query would look:</p>
<p><a href=clip_5F00_image002.jpg><img src=clip_5F00_image002.jpg alt=" "></a></p>
<h4 id=heading></h4>
<pre><code>ELEMENTS
<h5 class=taxonomy-title>Tags:</h5><ul class=taxonomy-terms>
<li><a class=taxonomy-term href=https://alguidelines.dev/tags/c/al/ data-taxonomy-term=c/al><span class=taxonomy-label>C/AL</span></a></li></ul></div><div class="taxonomy taxonomy-terms-article taxo-categories">
<h5 class=taxonomy-title>Categories:</h5><ul class=taxonomy-terms>
<li><a class=taxonomy-term href=https://alguidelines.dev/categories/pattern/ data-taxonomy-term=pattern><span class=taxonomy-label>Pattern</span></a></li></ul></div></header><p><em>Originally by Abshishek Ghosh and Bogdan Sturzoiu at Microsoft Development Center Copenhagen</em></p><h2 id=abstract>Abstract</h2><p>This pattern uses queries to create an efficient way to detect duplicate entries in a table. This is, for example, useful when trying to find out which customers or contacts have the same names, so we can merge them later.</p><h2 id=description>Description</h2><p>Duplicate detection has several requirements in Microsoft Dynamics NAV. One method to eliminate duplication is by defining the relevant field as the primary key. However, this method is not always practical either due to the size of the field or due to business requirements that dictate how duplicates are detected but not necessarily how they are eliminated. An example of this method is to detect contacts with the same name and take action to merge them if they are.</p><p>Before Dynamics NAV 2013, the only possibility was to iterate through the table in a loop and then create a sub-loop where another instance of the same table is filtered to check for duplicates. For example, to check for duplicate names in the Customer table, the code would look like this:</p><div class=highlight><pre tabindex=0 style=background-color:#f8f8f8;-moz-tab-size:4;-o-tab-size:4;tab-size:4><code class=language-al data-lang=al><span style=display:flex><span><span style=color:#204a87;font-weight:700>PROCEDURE</span><span style=color:#f8f8f8;text-decoration:underline> </span>HasDuplicateCustomers@<span style=color:#0000cf;font-weight:700>26</span><span style=color:#ce5c00;font-weight:700>() </span><span style=color:#000;font-weight:700>:</span><span style=color:#f8f8f8;text-decoration:underline> </span><span style=color:#204a87;font-weight:700>Boolean</span><span style=color:#000;font-weight:700>;</span><span style=color:#f8f8f8;text-decoration:underline>
</span></span></span><span style=display:flex><span><span style=color:#f8f8f8;text-decoration:underline></span><span style=color:#204a87;font-weight:700>VAR</span><span style=color:#f8f8f8;text-decoration:underline>
</span></span></span><span style=display:flex><span><span style=color:#f8f8f8;text-decoration:underline> </span>Customer@<span style=color:#0000cf;font-weight:700>1000</span><span style=color:#f8f8f8;text-decoration:underline> </span><span style=color:#000;font-weight:700>:</span><span style=color:#f8f8f8;text-decoration:underline> </span><span style=color:#204a87;font-weight:700>Record</span><span style=color:#f8f8f8;text-decoration:underline> </span><span style=color:#0000cf;font-weight:700>18</span><span style=color:#000;font-weight:700>;</span><span style=color:#f8f8f8;text-decoration:underline>
</span></span></span><span style=display:flex><span><span style=color:#f8f8f8;text-decoration:underline> </span>Customer2@<span style=color:#0000cf;font-weight:700>1001</span><span style=color:#f8f8f8;text-decoration:underline> </span><span style=color:#000;font-weight:700>:</span><span style=color:#f8f8f8;text-decoration:underline> </span><span style=color:#204a87;font-weight:700>Record</span><span style=color:#f8f8f8;text-decoration:underline> </span><span style=color:#0000cf;font-weight:700>18</span><span style=color:#000;font-weight:700>;</span><span style=color:#f8f8f8;text-decoration:underline>
</span></span></span><span style=display:flex><span><span style=color:#f8f8f8;text-decoration:underline></span><span style=color:#204a87;font-weight:700>BEGIN</span><span style=color:#f8f8f8;text-decoration:underline>
</span></span></span><span style=display:flex><span><span style=color:#f8f8f8;text-decoration:underline> </span><span style=color:#204a87;font-weight:700>IF</span><span style=color:#f8f8f8;text-decoration:underline> </span>Customer<span style=color:#ce5c00;font-weight:700>.</span>FINDSET<span style=color:#f8f8f8;text-decoration:underline> </span><span style=color:#204a87;font-weight:700>THEN</span><span style=color:#f8f8f8;text-decoration:underline>
</span></span></span><span style=display:flex><span><span style=color:#f8f8f8;text-decoration:underline> </span><span style=color:#204a87;font-weight:700>REPEAT</span><span style=color:#f8f8f8;text-decoration:underline>
</span></span></span><span style=display:flex><span><span style=color:#f8f8f8;text-decoration:underline> </span>Customer2<span style=color:#ce5c00;font-weight:700>.</span>SETRANGE<span style=color:#ce5c00;font-weight:700>(</span>Name<span style=color:#000;font-weight:700>,</span>Customer<span style=color:#ce5c00;font-weight:700>.</span>Name<span style=color:#ce5c00;font-weight:700>)</span><span style=color:#000;font-weight:700>;</span><span style=color:#f8f8f8;text-decoration:underline>
</span></span></span><span style=display:flex><span><span style=color:#f8f8f8;text-decoration:underline> </span><span style=color:#204a87;font-weight:700>IF</span><span style=color:#f8f8f8;text-decoration:underline> </span>Customer2<span style=color:#ce5c00;font-weight:700>.</span><span style=color:#204a87;font-weight:700>COUNT</span><span style=color:#f8f8f8;text-decoration:underline> </span>\&gt;<span style=color:#f8f8f8;text-decoration:underline> </span><span style=color:#0000cf;font-weight:700>1</span><span style=color:#f8f8f8;text-decoration:underline> </span><span style=color:#204a87;font-weight:700>THEN</span><span style=color:#f8f8f8;text-decoration:underline>
</span></span></span><span style=display:flex><span><span style=color:#f8f8f8;text-decoration:underline> </span><span style=color:#204a87;font-weight:700>EXIT</span><span style=color:#ce5c00;font-weight:700>(</span>TRUE<span style=color:#ce5c00;font-weight:700>)</span><span style=color:#000;font-weight:700>;</span><span style=color:#f8f8f8;text-decoration:underline>
</span></span></span><span style=display:flex><span><span style=color:#f8f8f8;text-decoration:underline> </span><span style=color:#204a87;font-weight:700>UNTIL</span><span style=color:#f8f8f8;text-decoration:underline> </span>Customer<span style=color:#ce5c00;font-weight:700>.</span>NEXT<span style=color:#f8f8f8;text-decoration:underline> </span>=<span style=color:#f8f8f8;text-decoration:underline> </span><span style=color:#0000cf;font-weight:700>0</span><span style=color:#000;font-weight:700>;</span><span style=color:#f8f8f8;text-decoration:underline>
</span></span></span><span style=display:flex><span><span style=color:#f8f8f8;text-decoration:underline> </span><span style=color:#204a87;font-weight:700>EXIT</span><span style=color:#ce5c00;font-weight:700>(</span>FALSE<span style=color:#ce5c00;font-weight:700>)</span><span style=color:#000;font-weight:700>;</span><span style=color:#f8f8f8;text-decoration:underline>
</span></span></span><span style=display:flex><span><span style=color:#f8f8f8;text-decoration:underline></span><span style=color:#204a87;font-weight:700>END</span><span style=color:#000;font-weight:700>;</span><span style=color:#f8f8f8;text-decoration:underline>
</span></span></span></code></pre></div><p>This code would involve setting filters on the <strong>Customer</strong> table as many times as there are records in the table. This is an expensive operation.</p><p>Starting with Dynamics NAV 2013, we can use queries to create a more efficient implementation of the same logic.</p><h2 id=usage>Usage</h2><p>The solution involves that you create a query to return duplicates, and then invoke it from a method that would test the value of the query to identify if duplicates were found.</p><p><strong>Step 1</strong> &ndash; <strong>Creating the Query</strong></p><ul>
<li>The query must be created with the table we want to search in as the dataitem.</li><li>The field we want to search for must be created as a grouped field.</li><li>Create a totaling field on the count, and add a filter for Count > 1. This ensures that only records with more than one instance of the field that we selected in the previous step are included in the query result.</li></ul><p>Continuing with our Customer Name example, here is how the query would look:</p><p><a href=clip_5F00_image002.jpg><img src=clip_5F00_image002.jpg alt=" "></a></p><h4 id=heading></h4><pre><code>ELEMENTS
{
{ 1 ; ;DataItem; ;
DataItemTable=Table18 }
@ -634,35 +508,20 @@ ColumnFilter=Count_=FILTER(\&gt;1);
MethodType=Totals;
Method=Count }
}
</code></pre>
<p><strong>Step 2 &ndash; Invoking the Query to Check for Duplicates</strong></p>
<p>Now that the query is created, all we need to do is to invoke the query and check if any records are returned, which would mean that there are duplicates.</p>
<p>Here is an alternate implementation of the <strong>HasDuplicateCustomers</strong> method using the query that we created:</p>
<div class=highlight><pre tabindex=0 style=background-color:#f8f8f8;-moz-tab-size:4;-o-tab-size:4;tab-size:4><code class=language-al data-lang=al><span style=color:#204a87;font-weight:700>PROCEDURE</span><span style=color:#f8f8f8;text-decoration:underline> </span>HasDuplicateCustomersWithQuery@<span style=color:#0000cf;font-weight:700>27</span><span style=color:#ce5c00;font-weight:700>() </span><span style=color:#000;font-weight:700>:</span><span style=color:#f8f8f8;text-decoration:underline> </span><span style=color:#204a87;font-weight:700>Boolean</span><span style=color:#000;font-weight:700>;</span><span style=color:#f8f8f8;text-decoration:underline>
</span><span style=color:#f8f8f8;text-decoration:underline></span><span style=color:#204a87;font-weight:700>VAR</span><span style=color:#f8f8f8;text-decoration:underline>
</span><span style=color:#f8f8f8;text-decoration:underline> </span>CustomerDuplicate@<span style=color:#0000cf;font-weight:700>1000</span><span style=color:#f8f8f8;text-decoration:underline> </span><span style=color:#000;font-weight:700>:</span><span style=color:#f8f8f8;text-decoration:underline> </span><span style=color:#204a87;font-weight:700>Query</span><span style=color:#f8f8f8;text-decoration:underline> </span><span style=color:#0000cf;font-weight:700>70000</span><span style=color:#000;font-weight:700>;</span><span style=color:#f8f8f8;text-decoration:underline>
</span><span style=color:#f8f8f8;text-decoration:underline></span><span style=color:#204a87;font-weight:700>BEGIN</span><span style=color:#f8f8f8;text-decoration:underline>
</span><span style=color:#f8f8f8;text-decoration:underline> </span>CustomerDuplicate<span style=color:#ce5c00;font-weight:700>.</span>OPEN<span style=color:#000;font-weight:700>;</span><span style=color:#f8f8f8;text-decoration:underline>
</span><span style=color:#f8f8f8;text-decoration:underline> </span><span style=color:#204a87;font-weight:700>EXIT</span><span style=color:#ce5c00;font-weight:700>(</span>CustomerDuplicate<span style=color:#ce5c00;font-weight:700>.</span>READ<span style=color:#ce5c00;font-weight:700>)</span><span style=color:#000;font-weight:700>;</span><span style=color:#f8f8f8;text-decoration:underline>
</span><span style=color:#f8f8f8;text-decoration:underline></span><span style=color:#204a87;font-weight:700>END</span><span style=color:#000;font-weight:700>;</span><span style=color:#f8f8f8;text-decoration:underline>
</span></code></pre></div><p><strong>Examples</strong></p>
<ul>
</code></pre><p><strong>Step 2 &ndash; Invoking the Query to Check for Duplicates</strong></p><p>Now that the query is created, all we need to do is to invoke the query and check if any records are returned, which would mean that there are duplicates.</p><p>Here is an alternate implementation of the <strong>HasDuplicateCustomers</strong> method using the query that we created:</p><div class=highlight><pre tabindex=0 style=background-color:#f8f8f8;-moz-tab-size:4;-o-tab-size:4;tab-size:4><code class=language-al data-lang=al><span style=display:flex><span><span style=color:#204a87;font-weight:700>PROCEDURE</span><span style=color:#f8f8f8;text-decoration:underline> </span>HasDuplicateCustomersWithQuery@<span style=color:#0000cf;font-weight:700>27</span><span style=color:#ce5c00;font-weight:700>() </span><span style=color:#000;font-weight:700>:</span><span style=color:#f8f8f8;text-decoration:underline> </span><span style=color:#204a87;font-weight:700>Boolean</span><span style=color:#000;font-weight:700>;</span><span style=color:#f8f8f8;text-decoration:underline>
</span></span></span><span style=display:flex><span><span style=color:#f8f8f8;text-decoration:underline></span><span style=color:#204a87;font-weight:700>VAR</span><span style=color:#f8f8f8;text-decoration:underline>
</span></span></span><span style=display:flex><span><span style=color:#f8f8f8;text-decoration:underline> </span>CustomerDuplicate@<span style=color:#0000cf;font-weight:700>1000</span><span style=color:#f8f8f8;text-decoration:underline> </span><span style=color:#000;font-weight:700>:</span><span style=color:#f8f8f8;text-decoration:underline> </span><span style=color:#204a87;font-weight:700>Query</span><span style=color:#f8f8f8;text-decoration:underline> </span><span style=color:#0000cf;font-weight:700>70000</span><span style=color:#000;font-weight:700>;</span><span style=color:#f8f8f8;text-decoration:underline>
</span></span></span><span style=display:flex><span><span style=color:#f8f8f8;text-decoration:underline></span><span style=color:#204a87;font-weight:700>BEGIN</span><span style=color:#f8f8f8;text-decoration:underline>
</span></span></span><span style=display:flex><span><span style=color:#f8f8f8;text-decoration:underline> </span>CustomerDuplicate<span style=color:#ce5c00;font-weight:700>.</span>OPEN<span style=color:#000;font-weight:700>;</span><span style=color:#f8f8f8;text-decoration:underline>
</span></span></span><span style=display:flex><span><span style=color:#f8f8f8;text-decoration:underline> </span><span style=color:#204a87;font-weight:700>EXIT</span><span style=color:#ce5c00;font-weight:700>(</span>CustomerDuplicate<span style=color:#ce5c00;font-weight:700>.</span>READ<span style=color:#ce5c00;font-weight:700>)</span><span style=color:#000;font-weight:700>;</span><span style=color:#f8f8f8;text-decoration:underline>
</span></span></span><span style=display:flex><span><span style=color:#f8f8f8;text-decoration:underline></span><span style=color:#204a87;font-weight:700>END</span><span style=color:#000;font-weight:700>;</span><span style=color:#f8f8f8;text-decoration:underline>
</span></span></span></code></pre></div><p><strong>Examples</strong></p><ul>
<li><strong>Acc. Sched. Chart Management</strong> codeunit (762),<br>
methods CheckDuplicateAccScheduleLineDescription and CheckDuplicateColumnLayoutColumnHeader</li>
<li><strong>Analysis Report Chart Mgt.</strong> codeunit (770),<br>
methods CheckDuplicateAnalysisLineDescription and CheckDuplicateAnalysisColumnHeader</li>
</ul>
<h2 id=consequences><strong>Consequences</strong></h2>
<p>A new query object is needed for every type of duplicate check. This could easily explode and create a maintenance problem.</p>
<div class="text-muted mt-5 pt-3 border-top">
methods CheckDuplicateAccScheduleLineDescription and CheckDuplicateColumnLayoutColumnHeader</li><li><strong>Analysis Report Chart Mgt.</strong> codeunit (770),<br>
methods CheckDuplicateAnalysisLineDescription and CheckDuplicateAnalysisColumnHeader</li></ul><h2 id=consequences><strong>Consequences</strong></h2><p>A new query object is needed for every type of duplicate check. This could easily explode and create a maintenance problem.</p><div class="text-muted mt-5 pt-3 border-top">
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