我有3个变量：@testid, @sampleid and @clientid.
我该如何设置@sampleid and @clientid通过执行此查询一次？
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
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
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