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POIn temporary tables/variables: join multiple rows to table with only 1 row
 

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  1. POIn temporary tables/variables: join multiple rows to table with only 1 row
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    <p><strong>Hi,</strong> I have a small problem of joining a temporary variable with a temporary table. Any input would be much appreciated. I present the problem in the order in which I have tried to solve it.</p> <p>First of, I have a temporary variable which is created from a select statement. The variable @enhet has 2 rows/observations (in my test file, later it will be many more):</p> <pre><code>declare @enhet varchar(50) SELECT @enhet = A.[EnhetsId] FROM [StatistikinlamningDataSKL].[dbo].[StatusHistorik] A inner join ( select [EnhetsId], max(SenastUppdaterad) as SenastDatum from [StatistikinlamningDataSKL].[dbo].[StatusHistorik] group by [EnhetsId] ) B on A.[EnhetsId] = B.[EnhetsId] and A.[SenastUppdaterad] = B.SenastDatum WHERE [NyStatus] = 4 </code></pre> <p>Secondly, I want to create a temporary table that combine these two observations (1 variable) with extra variables that are the same for both unique observations of variable @enhet. The aim is to have a table with unique values only for the variable @enhet but the rest is the same. </p> <pre><code>declare @temp2 table ( EnhetsId varchar(50), TjanstId Int, Tabell varchar(50), Kommentar ntext, Uppdaterad datetime ) insert into @temp2 ( EnhetsId, TjanstId, Tabell, Kommentar, Uppdaterad) values ( @enhet, 1, 'GR_PS09_1', 'KLAR', getdate()) select * from @temp2 </code></pre> <p>The problem is that when I run the script the output is only 1 row with just the last observation from the @enhet-variable. </p> <p>Is there anyone who knows what to do? I have tried many things but since I am new to SQL I have failed to write the correct scripts. Can anyone point me in the right direction?</p> <p>Thanks in advance and best regards! :)</p>
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    1. COThe variable `@enhet` does not have 2 rows/observations -- it is a scalar variable and can only hold 1 value. You can verify by adding `SELECT @enhet` to the end of your first block of code.
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    2. COThanks for your answer. I never thought of looking at SELECT @enhet, since I looked at the output before I added the "@enhet =" string. Thats why I failed to see the problem. Do you have any recommendation on how to make it work? I have tried make the first statement "@enhet" as a table instead of a (scalar) varialble, but still can´t figure out the right script to joint the two temporary tables.
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      1. USuser2995808
 

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