Microsoft/alguidelines
1
0
Fork 0
Code Issues Pull requests Projects Releases Packages Wiki Activity Actions
alguidelines/navpatterns/1-patterns/queries/use-queries-to-detect-duplicate-records/index.html
JeremyVyska d60c48d8a0 deploy: 10a2d6899e
2021-12-02 15:41:13 +00:00

324 lines
No EOL
36 KiB
HTML
Raw Blame History

<!doctype html><html lang=en class="js csstransforms3d">
<head>
<meta charset=utf-8>
<meta name=viewport content="width=device-width,initial-scale=1">
<meta name=generator content="Hugo 0.89.4">
<meta name=description content>
<title>use Queries to Detect Duplicate Records :: AL Guidelines</title>
<link href=/css/nucleus.css?1638459669 rel=stylesheet>
<link href=/css/fontawesome-all.min.css?1638459669 rel=stylesheet>
<link href=/css/featherlight.min.css?1638459669 rel=stylesheet>
<link href=/css/perfect-scrollbar.min.css?1638459669 rel=stylesheet>
<link href=/css/auto-complete.css?1638459669 rel=stylesheet>
<link href=/css/theme.css?1638459669 rel=stylesheet>
<link href=/css/theme-blue.css?1638459669 rel=stylesheet>
<link href=/css/variant.css?1638459669 rel=stylesheet>
<link href=/css/print.css?1638459669 rel=stylesheet media=print>
<script src=/js/jquery.min.js?1638459669></script>
<style>:root #header+#content>#left>#rlblock_left{display:none!important}</style>
</head>
<body data-url=/navpatterns/1-patterns/queries/use-queries-to-detect-duplicate-records/>
<script>var index_url="/index.json",root_url="/",baseUri=root_url.replace(/\/$/,'')</script>
<nav id=sidebar>
<div id=header-wrapper>
<div id=header>
<a id=logo href=/ style="color:#f5f5f5;font-family:segoe ui semibold,segoe ui,SegoeUI,helvetica neue,Helvetica,Arial,sans-serif;font-size:30px;font-weight:300;margin-top:-2px">
ALGuidelines.Dev
</a>
<i style=color:#f5f5f5>Code is Poetry ...</i>
</div>
<div class=searchbox>
<label for=search-by><i class="fas fa-search"></i></label>
<input data-search-input id=search-by type=search placeholder=Search...>
<span data-search-clear><i class="fas fa-times"></i></span>
</div>
<script src=/js/lunr.min.js?1638459669></script>
<script src=/js/auto-complete.js?1638459669></script>
<script src=/js/search.js?1638459669></script>
</div>
<div class=highlightable>
<ul class=topics>
<li data-nav-id=/welcome/ title=Welcome class=dd-item><a href=/welcome/><b><i class="fas fa-home"></i> </b>Welcome</a><ul></ul></li>
<li data-nav-id=/bcpatterns/ title="BC Patterns" class=dd-item><a href=/bcpatterns/><b><i class="fas fa-clone"></i> </b>BC Patterns</a><ul>
<li data-nav-id=/bcpatterns/facade-pattern/ title="Facade Pattern" class=dd-item><a href=/bcpatterns/facade-pattern/>Facade Pattern</a></li>
<li data-nav-id=/bcpatterns/generic-method-pattern/ title="Generic Method Pattern" class=dd-item><a href=/bcpatterns/generic-method-pattern/>Generic Method Pattern</a></li></ul></li>
<li data-nav-id=/bcbestpractices/ title="BC Dev. Best Practices" class=dd-item><a href=/bcbestpractices/><b><i class="fas fa-medal"></i> </b>BC Dev. Best Practices</a><ul></ul></li>
<li data-nav-id=/navpatterns/ title="NAV Patterns Archive" class="dd-item parent"><a href=/navpatterns/><b><i class="fas fa-save"></i> </b>NAV Patterns Archive</a><ul>
<li data-nav-id=/navpatterns/1-patterns/ title="1. Patterns" class="dd-item parent"><a href=/navpatterns/1-patterns/>1. Patterns</a><ul>
<li data-nav-id=/navpatterns/1-patterns/activity-log/ title="Activity Logs" class=dd-item><a href=/navpatterns/1-patterns/activity-log/>Activity Logs</a></li>
<li data-nav-id=/navpatterns/1-patterns/argument-table/ title="Argument Table" class=dd-item><a href=/navpatterns/1-patterns/argument-table/>Argument Table</a></li>
<li data-nav-id=/navpatterns/1-patterns/blocked-entity/ title="Blocked Entity" class=dd-item><a href=/navpatterns/1-patterns/blocked-entity/>Blocked Entity</a><ul>
<li data-nav-id=/navpatterns/1-patterns/blocked-entity/data-driven-blocked-entity/ title="Data Driven Blocked Entity" class=dd-item><a href=/navpatterns/1-patterns/blocked-entity/data-driven-blocked-entity/>Data Driven Blocked Entity</a></li></ul></li>
<li data-nav-id=/navpatterns/1-patterns/cached-web-service-calls/ title="Cached Web Server Calls" class=dd-item><a href=/navpatterns/1-patterns/cached-web-service-calls/>Cached Web Server Calls</a></li>
<li data-nav-id=/navpatterns/1-patterns/conditional-cascading-update/ title="Conditional Cascading Update" class=dd-item><a href=/navpatterns/1-patterns/conditional-cascading-update/>Conditional Cascading Update</a></li>
<li data-nav-id=/navpatterns/1-patterns/copy-document/ title="Copy Document" class=dd-item><a href=/navpatterns/1-patterns/copy-document/>Copy Document</a></li>
<li data-nav-id=/navpatterns/1-patterns/create-data-from-templates/ title="Create Data from Templates" class=dd-item><a href=/navpatterns/1-patterns/create-data-from-templates/>Create Data from Templates</a></li>
<li data-nav-id=/navpatterns/1-patterns/create-urls-to-nav-clients/ title="Create URLs to NAV Clients" class=dd-item><a href=/navpatterns/1-patterns/create-urls-to-nav-clients/>Create URLs to NAV Clients</a></li>
<li data-nav-id=/navpatterns/1-patterns/creating-custom-charts/ title="Creating Custom Charts" class=dd-item><a href=/navpatterns/1-patterns/creating-custom-charts/>Creating Custom Charts</a></li>
<li data-nav-id=/navpatterns/1-patterns/cross-session-events/ title="Cross Session Events" class=dd-item><a href=/navpatterns/1-patterns/cross-session-events/>Cross Session Events</a></li>
<li data-nav-id=/navpatterns/1-patterns/currently-active-record/ title="Currently Active Record" class=dd-item><a href=/navpatterns/1-patterns/currently-active-record/>Currently Active Record</a></li>
<li data-nav-id=/navpatterns/1-patterns/data-migration-facade/ title="Data Migration Facade" class=dd-item><a href=/navpatterns/1-patterns/data-migration-facade/>Data Migration Facade</a></li>
<li data-nav-id=/navpatterns/1-patterns/discovery-event/ title="Discovery Event" class=dd-item><a href=/navpatterns/1-patterns/discovery-event/>Discovery Event</a></li>
<li data-nav-id=/navpatterns/1-patterns/document/ title=Document class=dd-item><a href=/navpatterns/1-patterns/document/>Document</a></li>
<li data-nav-id=/navpatterns/1-patterns/easy-update-of-setup-or-supplementary-information/ title="Easy Update Of Setup Or Supplementary Information" class=dd-item><a href=/navpatterns/1-patterns/easy-update-of-setup-or-supplementary-information/>Easy Update Of Setup Or Supplementary Information</a></li>
<li data-nav-id=/navpatterns/1-patterns/error-message-processing/ title="Error Message Processing" class=dd-item><a href=/navpatterns/1-patterns/error-message-processing/>Error Message Processing</a></li>
<li data-nav-id=/navpatterns/1-patterns/extending-the-role-center-headlines/ title="Extending the Role Center Headlines" class=dd-item><a href=/navpatterns/1-patterns/extending-the-role-center-headlines/>Extending the Role Center Headlines</a></li>
<li data-nav-id=/navpatterns/1-patterns/feature-localization-for-data-structures/ title="Feature Localization For Data Structures" class=dd-item><a href=/navpatterns/1-patterns/feature-localization-for-data-structures/>Feature Localization For Data Structures</a></li>
<li data-nav-id=/navpatterns/1-patterns/hooks/ title=Hooks class=dd-item><a href=/navpatterns/1-patterns/hooks/>Hooks</a></li>
<li data-nav-id=/navpatterns/1-patterns/implementation-of-surrogate-keys-using-autoincrement-pattern/ title="Surrogate keys using Autoincrement Pattern" class=dd-item><a href=/navpatterns/1-patterns/implementation-of-surrogate-keys-using-autoincrement-pattern/>Surrogate keys using Autoincrement Pattern</a></li>
<li data-nav-id=/navpatterns/1-patterns/instructions-in-the-ui/ title="Instructions in the UI" class=dd-item><a href=/navpatterns/1-patterns/instructions-in-the-ui/>Instructions in the UI</a></li>
<li data-nav-id=/navpatterns/1-patterns/integration-of-addresses/ title="Integration of Addresses" class=dd-item><a href=/navpatterns/1-patterns/integration-of-addresses/>Integration of Addresses</a></li>
<li data-nav-id=/navpatterns/1-patterns/journal-error-processing/ title="Journal Error Processing" class=dd-item><a href=/navpatterns/1-patterns/journal-error-processing/>Journal Error Processing</a></li>
<li data-nav-id=/navpatterns/1-patterns/journal-template-batch-line/ title="Journal Template Batch Line" class=dd-item><a href=/navpatterns/1-patterns/journal-template-batch-line/>Journal Template Batch Line</a></li>
<li data-nav-id=/navpatterns/1-patterns/master-data/ title="Master Data" class=dd-item><a href=/navpatterns/1-patterns/master-data/>Master Data</a></li>
<li data-nav-id=/navpatterns/1-patterns/multi-file-download/ title="Multi-file Download" class=dd-item><a href=/navpatterns/1-patterns/multi-file-download/>Multi-file Download</a></li>
<li data-nav-id=/navpatterns/1-patterns/multi-page-list/ title="Multi-Page List" class=dd-item><a href=/navpatterns/1-patterns/multi-page-list/>Multi-Page List</a></li>
<li data-nav-id=/navpatterns/1-patterns/multilanguage-application-data/ title="Multilanguage Application Data" class=dd-item><a href=/navpatterns/1-patterns/multilanguage-application-data/>Multilanguage Application Data</a></li>
<li data-nav-id=/navpatterns/1-patterns/net-exception-handling-in-cal/ title="NET Exception Handling in CAL" class=dd-item><a href=/navpatterns/1-patterns/net-exception-handling-in-cal/>NET Exception Handling in CAL</a><ul>
<li data-nav-id=/navpatterns/1-patterns/net-exception-handling-in-cal/tryfunction-net-exception-handling-in-cal/ title="TryFunction NET Exception Handling in CAL" class=dd-item><a href=/navpatterns/1-patterns/net-exception-handling-in-cal/tryfunction-net-exception-handling-in-cal/>TryFunction NET Exception Handling in CAL</a></li></ul></li>
<li data-nav-id=/navpatterns/1-patterns/no-series/ title="No Series" class=dd-item><a href=/navpatterns/1-patterns/no-series/>No Series</a></li>
<li data-nav-id=/navpatterns/1-patterns/notifications/ title=Notifications class=dd-item><a href=/navpatterns/1-patterns/notifications/>Notifications</a><ul>
<li data-nav-id=/navpatterns/1-patterns/notifications/in-context-notifications/ title="In-context Notifications" class=dd-item><a href=/navpatterns/1-patterns/notifications/in-context-notifications/>In-context Notifications</a></li>
<li data-nav-id=/navpatterns/1-patterns/notifications/notification-lifecycle-management-pattern/ title="Notification Lifecycle Management Pattern" class=dd-item><a href=/navpatterns/1-patterns/notifications/notification-lifecycle-management-pattern/>Notification Lifecycle Management Pattern</a></li></ul></li>
<li data-nav-id=/navpatterns/1-patterns/observer/ title=Observer class=dd-item><a href=/navpatterns/1-patterns/observer/>Observer</a></li>
<li data-nav-id=/navpatterns/1-patterns/posting-routine-select-behavior/ title="Posting Routine - Select Behavior" class=dd-item><a href=/navpatterns/1-patterns/posting-routine-select-behavior/>Posting Routine - Select Behavior</a></li>
<li data-nav-id=/navpatterns/1-patterns/product-name/ title="Product Name" class=dd-item><a href=/navpatterns/1-patterns/product-name/>Product Name</a></li>
<li data-nav-id=/navpatterns/1-patterns/queries/ title=Queries class="dd-item parent"><a href=/navpatterns/1-patterns/queries/>Queries</a><ul>
<li data-nav-id=/navpatterns/1-patterns/queries/select-distinct-with-queries/ title="SELECT DISTINCT with Queries" class=dd-item><a href=/navpatterns/1-patterns/queries/select-distinct-with-queries/>SELECT DISTINCT with Queries</a></li>
<li data-nav-id=/navpatterns/1-patterns/queries/use-queries-to-detect-duplicate-records/ title="use Queries to Detect Duplicate Records" class="dd-item active"><a href=/navpatterns/1-patterns/queries/use-queries-to-detect-duplicate-records/>use Queries to Detect Duplicate Records</a></li>
<li data-nav-id=/navpatterns/1-patterns/queries/use-queries-to-replace-nested-loops/ title="Use Queries to Replace Nested Loops" class=dd-item><a href=/navpatterns/1-patterns/queries/use-queries-to-replace-nested-loops/>Use Queries to Replace Nested Loops</a></li></ul></li>
<li data-nav-id=/navpatterns/1-patterns/read-once-initialization-and-validation/ title="Read-once Initialization and Validation" class=dd-item><a href=/navpatterns/1-patterns/read-once-initialization-and-validation/>Read-once Initialization and Validation</a></li>
<li data-nav-id=/navpatterns/1-patterns/released-entity/ title="Released Entity" class=dd-item><a href=/navpatterns/1-patterns/released-entity/>Released Entity</a></li>
<li data-nav-id=/navpatterns/1-patterns/report-selection/ title="Report Selection" class=dd-item><a href=/navpatterns/1-patterns/report-selection/>Report Selection</a></li>
<li data-nav-id=/navpatterns/1-patterns/security/ title=Security class=dd-item><a href=/navpatterns/1-patterns/security/>Security</a></li>
<li data-nav-id=/navpatterns/1-patterns/setup-specificity-fallback/ title="Setup Specificity Fallback" class=dd-item><a href=/navpatterns/1-patterns/setup-specificity-fallback/>Setup Specificity Fallback</a></li>
<li data-nav-id=/navpatterns/1-patterns/silent-file-upload-and-download/ title="Silent File Upload and Download" class=dd-item><a href=/navpatterns/1-patterns/silent-file-upload-and-download/>Silent File Upload and Download</a></li>
<li data-nav-id=/navpatterns/1-patterns/singleton/ title=Singleton class=dd-item><a href=/navpatterns/1-patterns/singleton/>Singleton</a><ul>
<li data-nav-id=/navpatterns/1-patterns/singleton/singleton-codeunit/ title="Singleton Codeunit" class=dd-item><a href=/navpatterns/1-patterns/singleton/singleton-codeunit/>Singleton Codeunit</a></li>
<li data-nav-id=/navpatterns/1-patterns/singleton/singleton-table/ title="Singleton Table" class=dd-item><a href=/navpatterns/1-patterns/singleton/singleton-table/>Singleton Table</a><ul>
<li data-nav-id=/navpatterns/1-patterns/singleton/singleton-table/cue-table/ title="Cue Table" class=dd-item><a href=/navpatterns/1-patterns/singleton/singleton-table/cue-table/>Cue Table</a></li>
<li data-nav-id=/navpatterns/1-patterns/singleton/singleton-table/setup-table/ title="Setup Table" class=dd-item><a href=/navpatterns/1-patterns/singleton/singleton-table/setup-table/>Setup Table</a></li></ul></li></ul></li>
<li data-nav-id=/navpatterns/1-patterns/standard-journal/ title="Standard Journal" class=dd-item><a href=/navpatterns/1-patterns/standard-journal/>Standard Journal</a></li>
<li data-nav-id=/navpatterns/1-patterns/temporary-dataset-report/ title="Temporary Dataset Report" class=dd-item><a href=/navpatterns/1-patterns/temporary-dataset-report/>Temporary Dataset Report</a></li>
<li data-nav-id=/navpatterns/1-patterns/totals-and-discounts-on-subpages-sales-and-purchases/ title="Totals and Discounts on Subpages Sales and Purchases" class=dd-item><a href=/navpatterns/1-patterns/totals-and-discounts-on-subpages-sales-and-purchases/>Totals and Discounts on Subpages Sales and Purchases</a></li>
<li data-nav-id=/navpatterns/1-patterns/transfer-custom-fields/ title="Transfer Custom Fields" class=dd-item><a href=/navpatterns/1-patterns/transfer-custom-fields/>Transfer Custom Fields</a></li>
<li data-nav-id=/navpatterns/1-patterns/variant-facade/ title="Variant Facade" class=dd-item><a href=/navpatterns/1-patterns/variant-facade/>Variant Facade</a></li></ul></li>
<li data-nav-id=/navpatterns/2-anti-patterns/ title="2. Anti-Patterns" class=dd-item><a href=/navpatterns/2-anti-patterns/>2. Anti-Patterns</a><ul>
<li data-nav-id=/navpatterns/2-anti-patterns/nav-upgrade/ title="Nav Upgrade" class=dd-item><a href=/navpatterns/2-anti-patterns/nav-upgrade/>Nav Upgrade</a></li>
<li data-nav-id=/navpatterns/2-anti-patterns/reusable-bugs/ title="Reusable Bugs" class=dd-item><a href=/navpatterns/2-anti-patterns/reusable-bugs/>Reusable Bugs</a></li></ul></li>
<li data-nav-id=/navpatterns/3-cal-coding-guidelines/ title="3. CAL Coding Guidelines" class=dd-item><a href=/navpatterns/3-cal-coding-guidelines/>3. CAL Coding Guidelines</a><ul>
<li data-nav-id=/navpatterns/3-cal-coding-guidelines/design/ title=Design class=dd-item><a href=/navpatterns/3-cal-coding-guidelines/design/>Design</a></li>
<li data-nav-id=/navpatterns/3-cal-coding-guidelines/internally-used-dot-net-types/ title="Internally-used DotNet Types" class=dd-item><a href=/navpatterns/3-cal-coding-guidelines/internally-used-dot-net-types/>Internally-used DotNet Types</a></li>
<li data-nav-id=/navpatterns/3-cal-coding-guidelines/internationalization/ title=Internationalization class=dd-item><a href=/navpatterns/3-cal-coding-guidelines/internationalization/>Internationalization</a><ul>
<li data-nav-id=/navpatterns/3-cal-coding-guidelines/internationalization/using-calcdate/ title="Using Calcdate" class=dd-item><a href=/navpatterns/3-cal-coding-guidelines/internationalization/using-calcdate/>Using Calcdate</a></li></ul></li>
<li data-nav-id=/navpatterns/3-cal-coding-guidelines/localizability/ title=Localizability class=dd-item><a href=/navpatterns/3-cal-coding-guidelines/localizability/>Localizability</a><ul>
<li data-nav-id=/navpatterns/3-cal-coding-guidelines/localizability/captionml-for-system-tables/ title="CaptionML on System Pages" class=dd-item><a href=/navpatterns/3-cal-coding-guidelines/localizability/captionml-for-system-tables/>CaptionML on System Pages</a></li>
<li data-nav-id=/navpatterns/3-cal-coding-guidelines/localizability/fieldcaption-and-tablecaption/ title="FIELDCAPTION and TABLECAPTION" class=dd-item><a href=/navpatterns/3-cal-coding-guidelines/localizability/fieldcaption-and-tablecaption/>FIELDCAPTION and TABLECAPTION</a></li>
<li data-nav-id=/navpatterns/3-cal-coding-guidelines/localizability/global-text-constants/ title="Global Text Constants" class=dd-item><a href=/navpatterns/3-cal-coding-guidelines/localizability/global-text-constants/>Global Text Constants</a></li>
<li data-nav-id=/navpatterns/3-cal-coding-guidelines/localizability/use-text-constants/ title="Use Text Constants" class=dd-item><a href=/navpatterns/3-cal-coding-guidelines/localizability/use-text-constants/>Use Text Constants</a></li>
<li data-nav-id=/navpatterns/3-cal-coding-guidelines/localizability/using-optioncaptionml/ title="Using OptionCaptionML" class=dd-item><a href=/navpatterns/3-cal-coding-guidelines/localizability/using-optioncaptionml/>Using OptionCaptionML</a></li></ul></li>
<li data-nav-id=/navpatterns/3-cal-coding-guidelines/readability/ title=Readability class=dd-item><a href=/navpatterns/3-cal-coding-guidelines/readability/>Readability</a><ul>
<li data-nav-id=/navpatterns/3-cal-coding-guidelines/readability/begin-as-an-afterword/ title="Begin as an 'After Word'" class=dd-item><a href=/navpatterns/3-cal-coding-guidelines/readability/begin-as-an-afterword/>Begin as an 'After Word'</a></li>
<li data-nav-id=/navpatterns/3-cal-coding-guidelines/readability/begin-end/ title="Begin-End - Compound Only" class=dd-item><a href=/navpatterns/3-cal-coding-guidelines/readability/begin-end/>Begin-End - Compound Only</a></li>
<li data-nav-id=/navpatterns/3-cal-coding-guidelines/readability/binary-operator-line-start/ title="Binary Operator to Start Line" class=dd-item><a href=/navpatterns/3-cal-coding-guidelines/readability/binary-operator-line-start/>Binary Operator to Start Line</a></li>
<li data-nav-id=/navpatterns/3-cal-coding-guidelines/readability/blank-lines/ title="Blank Lines.md" class=dd-item><a href=/navpatterns/3-cal-coding-guidelines/readability/blank-lines/>Blank Lines.md</a></li>
<li data-nav-id=/navpatterns/3-cal-coding-guidelines/readability/case-actions/ title="CASE Action" class=dd-item><a href=/navpatterns/3-cal-coding-guidelines/readability/case-actions/>CASE Action</a></li>
<li data-nav-id=/navpatterns/3-cal-coding-guidelines/readability/colon-usage-in-case/ title="Colon usage in CASE" class=dd-item><a href=/navpatterns/3-cal-coding-guidelines/readability/colon-usage-in-case/>Colon usage in CASE</a></li>
<li data-nav-id=/navpatterns/3-cal-coding-guidelines/readability/comments-curly-brackets/ title="Comments inside Curly Brackets" class=dd-item><a href=/navpatterns/3-cal-coding-guidelines/readability/comments-curly-brackets/>Comments inside Curly Brackets</a></li>
<li data-nav-id=/navpatterns/3-cal-coding-guidelines/readability/comments-spacing/ title="Comment Spacing" class=dd-item><a href=/navpatterns/3-cal-coding-guidelines/readability/comments-spacing/>Comment Spacing</a></li>
<li data-nav-id=/navpatterns/3-cal-coding-guidelines/readability/end-else-pair/ title="END ELSE Pair" class=dd-item><a href=/navpatterns/3-cal-coding-guidelines/readability/end-else-pair/>END ELSE Pair</a></li>
<li data-nav-id=/navpatterns/3-cal-coding-guidelines/readability/indentation/ title=Indentation class=dd-item><a href=/navpatterns/3-cal-coding-guidelines/readability/indentation/>Indentation</a></li>
<li data-nav-id=/navpatterns/3-cal-coding-guidelines/readability/keyword-pairs-indentation/ title="Keyword Pairs - Indentation" class=dd-item><a href=/navpatterns/3-cal-coding-guidelines/readability/keyword-pairs-indentation/>Keyword Pairs - Indentation</a></li>
<li data-nav-id=/navpatterns/3-cal-coding-guidelines/readability/line-start-keywords/ title="Line Start Keywords" class=dd-item><a href=/navpatterns/3-cal-coding-guidelines/readability/line-start-keywords/>Line Start Keywords</a></li>
<li data-nav-id=/navpatterns/3-cal-coding-guidelines/readability/lonely-repeat/ title="Lonely Repeat" class=dd-item><a href=/navpatterns/3-cal-coding-guidelines/readability/lonely-repeat/>Lonely Repeat</a></li>
<li data-nav-id=/navpatterns/3-cal-coding-guidelines/readability/named-invocations/ title="Named Invocations" class=dd-item><a href=/navpatterns/3-cal-coding-guidelines/readability/named-invocations/>Named Invocations</a></li>
<li data-nav-id=/navpatterns/3-cal-coding-guidelines/readability/nested-withs/ title="Nested WITHs" class=dd-item><a href=/navpatterns/3-cal-coding-guidelines/readability/nested-withs/>Nested WITHs</a></li>
<li data-nav-id=/navpatterns/3-cal-coding-guidelines/readability/one-statement-per-line/ title="One Statement Per Line" class=dd-item><a href=/navpatterns/3-cal-coding-guidelines/readability/one-statement-per-line/>One Statement Per Line</a></li>
<li data-nav-id=/navpatterns/3-cal-coding-guidelines/readability/separate-if-and-else/ title="Separate IF and ELSE" class=dd-item><a href=/navpatterns/3-cal-coding-guidelines/readability/separate-if-and-else/>Separate IF and ELSE</a></li>
<li data-nav-id=/navpatterns/3-cal-coding-guidelines/readability/spacing-binary-operators/ title="Spacing Binary Operators" class=dd-item><a href=/navpatterns/3-cal-coding-guidelines/readability/spacing-binary-operators/>Spacing Binary Operators</a></li>
<li data-nav-id=/navpatterns/3-cal-coding-guidelines/readability/spacing-brackets-and/ title="Spacing Brackets and ::" class=dd-item><a href=/navpatterns/3-cal-coding-guidelines/readability/spacing-brackets-and/>Spacing Brackets and ::</a></li>
<li data-nav-id=/navpatterns/3-cal-coding-guidelines/readability/spacing-unary-operators/ title="Spacing Unary Operators" class=dd-item><a href=/navpatterns/3-cal-coding-guidelines/readability/spacing-unary-operators/>Spacing Unary Operators</a></li>
<li data-nav-id=/navpatterns/3-cal-coding-guidelines/readability/suggested-abbreviations/ title="Suggested Abbreviations" class=dd-item><a href=/navpatterns/3-cal-coding-guidelines/readability/suggested-abbreviations/>Suggested Abbreviations</a></li>
<li data-nav-id=/navpatterns/3-cal-coding-guidelines/readability/temporary-variable-naming/ title="Temporary Variable Naming" class=dd-item><a href=/navpatterns/3-cal-coding-guidelines/readability/temporary-variable-naming/>Temporary Variable Naming</a></li>
<li data-nav-id=/navpatterns/3-cal-coding-guidelines/readability/textconst-suffixes/ title="TextConst Suffixes" class=dd-item><a href=/navpatterns/3-cal-coding-guidelines/readability/textconst-suffixes/>TextConst Suffixes</a></li>
<li data-nav-id=/navpatterns/3-cal-coding-guidelines/readability/unary-operator-line-end/ title="Unary Operator Line End" class=dd-item><a href=/navpatterns/3-cal-coding-guidelines/readability/unary-operator-line-end/>Unary Operator Line End</a></li>
<li data-nav-id=/navpatterns/3-cal-coding-guidelines/readability/unnecessary-compound-parenthesis/ title="Unnecessary Compound Parenthesis" class=dd-item><a href=/navpatterns/3-cal-coding-guidelines/readability/unnecessary-compound-parenthesis/>Unnecessary Compound Parenthesis</a></li>
<li data-nav-id=/navpatterns/3-cal-coding-guidelines/readability/unnecessary-else/ title="Unnecessary ELSE" class=dd-item><a href=/navpatterns/3-cal-coding-guidelines/readability/unnecessary-else/>Unnecessary ELSE</a></li>
<li data-nav-id=/navpatterns/3-cal-coding-guidelines/readability/unnecessary-function-parenthesis/ title="Unnecessary Function Parenthesis" class=dd-item><a href=/navpatterns/3-cal-coding-guidelines/readability/unnecessary-function-parenthesis/>Unnecessary Function Parenthesis</a></li>
<li data-nav-id=/navpatterns/3-cal-coding-guidelines/readability/unnecessary-separators/ title="Unnecessary Separators" class=dd-item><a href=/navpatterns/3-cal-coding-guidelines/readability/unnecessary-separators/>Unnecessary Separators</a></li>
<li data-nav-id=/navpatterns/3-cal-coding-guidelines/readability/unnecessary-truefalse/ title="Unnecessary TRUE/FALSE" class=dd-item><a href=/navpatterns/3-cal-coding-guidelines/readability/unnecessary-truefalse/>Unnecessary TRUE/FALSE</a></li>
<li data-nav-id=/navpatterns/3-cal-coding-guidelines/readability/variable-already-scoped/ title="Variable Already Scoped" class=dd-item><a href=/navpatterns/3-cal-coding-guidelines/readability/variable-already-scoped/>Variable Already Scoped</a></li>
<li data-nav-id=/navpatterns/3-cal-coding-guidelines/readability/variable-naming/ title="Variable Naming" class=dd-item><a href=/navpatterns/3-cal-coding-guidelines/readability/variable-naming/>Variable Naming</a></li>
<li data-nav-id=/navpatterns/3-cal-coding-guidelines/readability/variables-declarations-order/ title="Variables Declarations Order" class=dd-item><a href=/navpatterns/3-cal-coding-guidelines/readability/variables-declarations-order/>Variables Declarations Order</a></li></ul></li>
<li data-nav-id=/navpatterns/3-cal-coding-guidelines/ux/ title=UX class=dd-item><a href=/navpatterns/3-cal-coding-guidelines/ux/>UX</a><ul>
<li data-nav-id=/navpatterns/3-cal-coding-guidelines/ux/actions-images/ title="Actions - Images" class=dd-item><a href=/navpatterns/3-cal-coding-guidelines/ux/actions-images/>Actions - Images</a></li>
<li data-nav-id=/navpatterns/3-cal-coding-guidelines/ux/confirm/ title=CONFIRM class=dd-item><a href=/navpatterns/3-cal-coding-guidelines/ux/confirm/>CONFIRM</a></li>
<li data-nav-id=/navpatterns/3-cal-coding-guidelines/ux/fielderror/ title=FIELDERROR class=dd-item><a href=/navpatterns/3-cal-coding-guidelines/ux/fielderror/>FIELDERROR</a></li>
<li data-nav-id=/navpatterns/3-cal-coding-guidelines/ux/message-and-error/ title="MESSAGE and ERROR" class=dd-item><a href=/navpatterns/3-cal-coding-guidelines/ux/message-and-error/>MESSAGE and ERROR</a></li></ul></li></ul></li>
<li data-nav-id=/navpatterns/4-get-involved/ title="(OLD) Get Involved" class=dd-item><a href=/navpatterns/4-get-involved/>(OLD) Get Involved</a><ul>
<li data-nav-id=/navpatterns/4-get-involved/code-of-conduct/ title="Code of Conduct" class=dd-item><a href=/navpatterns/4-get-involved/code-of-conduct/>Code of Conduct</a></li>
<li data-nav-id=/navpatterns/4-get-involved/patterns-authors/ title="Patterns Authors" class=dd-item><a href=/navpatterns/4-get-involved/patterns-authors/>Patterns Authors</a></li>
<li data-nav-id=/navpatterns/4-get-involved/template-for-writing-nav-design-patterns/ title="Template for writing Nav Design Patterns" class=dd-item><a href=/navpatterns/4-get-involved/template-for-writing-nav-design-patterns/>Template for writing Nav Design Patterns</a></li></ul></li>
<li data-nav-id=/navpatterns/related-links/ title="Related Links" class=dd-item><a href=/navpatterns/related-links/>Related Links</a></li></ul></li>
<li data-nav-id=/contributing/ title=Contributing class=dd-item><a href=/contributing/><b><i class="fas fa-clone"></i> </b>Contributing</a><ul>
<li data-nav-id=/contributing/formattingtips/ title="Formatting tips" class=dd-item><a href=/contributing/formattingtips/><b><i class="fas fa-clone"></i> </b>Formatting tips</a></li>
<li data-nav-id=/contributing/forkandpr/ title="Guide to Fork & PR" class=dd-item><a href=/contributing/forkandpr/><b><i class="fas fa-clone"></i> </b>Guide to Fork & PR</a></li>
<li data-nav-id=/contributing/templates/ title=Templates class=dd-item><a href=/contributing/templates/><b><i class="fas fa-clone"></i> </b>Templates</a><ul>
<li data-nav-id=/contributing/templates/guidelines/ title="Title of the Guideline" class=dd-item><a href=/contributing/templates/guidelines/>Title of the Guideline</a></li>
<li data-nav-id=/contributing/templates/patterns/ title="Title of the pattern" class=dd-item><a href=/contributing/templates/patterns/>Title of the pattern</a></li></ul></li>
<li data-nav-id=/contributing/theapprovalprocess/ title="Understanding the Approval Process" class=dd-item><a href=/contributing/theapprovalprocess/><b><i class="fas fa-clone"></i> </b>Understanding the Approval Process</a></li></ul></li>
</ul>
<div id=shortcuts>
<div class=nav-title>More</div>
<ul>
<li><a class=padding href=https://discord.gg/4wbfNv3><i class="fab fa-discord"></i> BC Discord</a></li>
<li><a class=padding href=https://github.com/microsoft/alguidelines><i class="fab fa-github"></i> GitHub repo</a></li>
</ul>
</div>
<div id=footer>
<p>Built with <a href=https://github.com/McShelby/hugo-theme-relearn><i class="fas fa-heart"></i></a> by <a href=https://gohugo.io/>Hugo</a></p>
</div>
</div>
</nav>
<div id=body>
<div id=overlay></div>
<div class="padding highlightable">
<div id=top-bar>
<div id=top-github-link>
<a class=github-link title="Edit this page" href=https://github.com/microsoft/alguidelines/edit/main/content/NAVPatterns/1-patterns/queries/use-queries-to-detect-duplicate-records/index.md target=blank>
<i class="fas fa-code-branch"></i>
<span id=top-github-link-text>Edit this page</span>
</a>
</div>
<div id=breadcrumbs>
<span id=sidebar-toggle-span>
<a href=# id=sidebar-toggle data-sidebar-toggle>
<i class="fas fa-bars"></i>
</a>
</span>
<span id=toc-menu><i class="fas fa-list-alt"></i></span>
<ol class=links itemscope itemtype=http://schema.org/BreadcrumbList>
<meta itemprop=itemListOrder content="Descending">
<li itemscope itemtype=https://schema.org/ListItem itemprop=itemListElement><meta itemprop=position content="5"><a itemprop=item href=/><span itemprop=name>Home</span></a> > </li>
<li itemscope itemtype=https://schema.org/ListItem itemprop=itemListElement><meta itemprop=position content="4"><a itemprop=item href=/navpatterns/><span itemprop=name>NAV Patterns Archive</span></a> > </li>
<li itemscope itemtype=https://schema.org/ListItem itemprop=itemListElement><meta itemprop=position content="3"><a itemprop=item href=/navpatterns/1-patterns/><span itemprop=name>1. Patterns</span></a> > </li>
<li itemscope itemtype=https://schema.org/ListItem itemprop=itemListElement><meta itemprop=position content="2"><a itemprop=item href=/navpatterns/1-patterns/queries/><span itemprop=name>Queries</span></a> > </li>
<li itemscope itemtype=https://schema.org/ListItem itemprop=itemListElement><meta itemprop=position content="1"><a itemprop=item href=/navpatterns/1-patterns/queries/use-queries-to-detect-duplicate-records/ aria-disabled=true><span itemprop=name>use Queries to Detect Duplicate Records</span></a></li>
</ol>
</div>
<div class=progress>
<div class=wrapper>
<nav id=TableOfContents>
<ul>
<li><a href=#abstract><strong>Abstract</strong></a></li>
<li><a href=#description><strong>Description</strong></a>
<ul>
<li></li>
</ul>
</li>
<li><a href=#usage><strong>Usage</strong></a>
<ul>
<li></li>
</ul>
</li>
<li><a href=#consequences><strong>Consequences</strong></a></li>
</ul>
</nav>
</div>
</div>
</div>
<div id=head-tags>
</div>
<main id=body-inner>
<h1>use Queries to Detect Duplicate Records</h1>
<p><em>Originally by Abshishek Ghosh and Bogdan Sturzoiu at Microsoft Development Center Copenhagen**<br>
**</em></p>
<h2 id=abstract><strong>Abstract</strong></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><strong>Description</strong></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>
<pre><code>PROCEDURE HasDuplicateCustomers@26() : Boolean;
VAR
Customer@1000 : Record 18;
Customer2@1001 : Record 18;
BEGIN
IF Customer.FINDSET THEN
REPEAT
Customer2.SETRANGE(Name,Customer.Name);
IF Customer2.COUNT \&gt; 1 THEN
EXIT(TRUE);
UNTIL Customer.NEXT = 0;
EXIT(FALSE);
END;
</code></pre>
<h4 id=heading></h4>
<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><strong>Usage</strong></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>**Step 1 ****&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-1></h4>
<pre><code>ELEMENTS
{
{ 1 ; ;DataItem; ;
DataItemTable=Table18 }
{ 2 ;1 ;Column ; ;
DataSource=Name }
{ 3 ;1 ;Column ; ;
ColumnFilter=Count\_=FILTER(\&gt;1);
MethodType=Totals;
Method=Count }
}
</code></pre>
<p>**<br>
**</p>
<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>
<pre><code>PROCEDURE HasDuplicateCustomersWithQuery@27() : Boolean;
VAR
CustomerDuplicate@1000 : Query 70000;
BEGIN
CustomerDuplicate.OPEN;
EXIT(CustomerDuplicate.READ);
END;
</code></pre>
<h4 id=heading-2></h4>
<p><strong>Examples</strong></p>
<ul>
<li>**Acc. Sched. Chart Management **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>
<footer class=footline>
</footer>
</main>
</div>
<div id=navigation>
<a class="nav nav-prev" href=/navpatterns/1-patterns/queries/select-distinct-with-queries/ title="SELECT DISTINCT with Queries"><i class="fa fa-chevron-left"></i></a>
<a class="nav nav-next" href=/navpatterns/1-patterns/queries/use-queries-to-replace-nested-loops/ title="Use Queries to Replace Nested Loops"><i class="fa fa-chevron-right"></i></a>
</div>
</div>
<div style=left:-1000px;overflow:scroll;position:absolute;top:-1000px;border:none;box-sizing:content-box;height:200px;margin:0;padding:0;width:200px>
<div style=border:none;box-sizing:content-box;height:200px;margin:0;padding:0;width:200px></div>
</div>
<script src=/js/clipboard.min.js?1638459669></script>
<script src=/js/perfect-scrollbar.min.js?1638459669></script>
<script src=/js/perfect-scrollbar.jquery.min.js?1638459669></script>
<script src=/js/jquery.svg.pan.zoom.js?1638459669></script>
<script src=/js/featherlight.min.js?1638459669></script>
<script src=/js/modernizr.custom-3.6.0.js?1638459669></script>
<script src=/js/relearn.js?1638459669></script>
</body>
</html>
Reference in a new issue View git blame Copy permalink