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POTSql equality on groups of rows
 

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    <p>I have a table that contains information on groups. There can be any number of members in a group. There is a group identifier and then an element identifier. I want to be able to in a single statement determine whether or not a given set exists in the table</p> <p>@groupTable is an example of the data that already exists in the database</p> <p>@inputData is the data that I want to see if it already exists in @groupTable</p> <pre><code>declare @groupData table ( groupIdentifier int, elementIdentifier uniqueidentifier ) insert into @groupData values (1, 'dfce40b1-3719-4e4c-acfa-65f728677700'), (1, '89e7e6be-cee8-40a7-8135-a54659e0d88c') declare @inputData table ( tempGroupIdentifier int, elementIdentifier uniqueidentifier ) insert into @inputData values (42, 'dfce40b1-3719-4e4c-acfa-65f728677700'), (42, '89e7e6be-cee8-40a7-8135-a54659e0d88c'), (55, 'dfce40b1-3719-4e4c-acfa-65f728677700'), (55, '2395a42c-94f4-4cda-a773-221b26ea5e44'), (55, 'f22db9df-a1f4-4078-b74c-90e34376eff6') </code></pre> <p>Now I want to run a query that will show the relationship of the sets, showing which groupIdentifier is associated with which tempGroupIdentifier. If there is no matching set then I need to know that too.</p> <pre><code>desired output: groupIdentifier, tempGroupIdentifier 1, 42 null, 55 </code></pre> <p>Does anyone any suggestions on how to approach this problem? </p> <p>I could probably pivot the rows and concat all elementIdentifiers into a giant string for each group that then do equality on, but that doesn't seem like a good solution.</p>
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    1. USBrandonAGr
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    1. COIf you got both as tables (real and temp), wouldn't a left join do the job? or am I missing the real problem here.
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      1. USSyska
    2. COIn your sample data, the value 'dfce40b1-3719-4e4c-acfa-65f728677700' exists twice in your @inputdata table; was that intentional?
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      1. USStuart Ainsworth
    3. CO@Syska: yes, but it isn't "per row" but "per set of rows"
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      1. USgbn
 

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