Come posso impostare più variabili T-SQL in una singola query SELECT?

Question

Ho 3 variabili: @testid, @sampleid e @clientid.

Come è possibile impostare @sampleid e @clientid eseguendo questa query una volta?

SELECT 
    [sample].sampleid, 
    [client].clientid 
FROM 
    dbo.[test] 
    LEFT OUTER JOIN dbo.[sampleslice] ON dbo.[test].samplesliceid = dbo.[sampleslice].samplesliceid 
    LEFT OUTER JOIN dbo.[sample] ON dbo.[sampleslice].sampleid = dbo.[sample].sampleid 
    LEFT OUTER JOIN dbo.[client] ON dbo.[sample].clientid = dbo.[client].clientid 
WHERE 
    testid = @testid 

Answer 1

DECLARE @sampleid YOUR_VAR_TYPE; 
DECLARE @clientid YOUR_VAR_TYPE; 

SELECT 
    @sampleid = [sample].sampleid, 
    @clientid = [client].clientid 
FROM dbo.[test] 


-- The variables are now initialized. You can now use them below.above