SQL Server while loop union all [closed]

Answer 1

Instead of trying to use UNION I would use a temp table or temp table variable to merge the result sets

CREATE TABLE #Temp
(
  
)

 DECLARE @position INT
 SET @position = -1

 WHILE(@position < 1)
 BEGIN

    INSERT INTO #Temp ()
    SELECT * FROM mytable

    SET @position = @position + 1

 END

 SELECT * FROM #Temp