How to set value to variable using ‘execute’ in t-sql?

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You can use output parameters with sp_executesql.

DECLARE @dbName nvarchar(128) = 'myDb'
DECLARE @siteId int 
DECLARE @SQL nvarchar(max) = N'SELECT TOP 1 @outputFromExec = Id FROM ' + quotename(@dbName) + N'..myTbl'
exec sp_executesql @SQL, N'@outputFromExec int out', @siteId out
select @siteId

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