Question

I am creating a stored procedure but it throws an error.
Can anybody tell me if there is something i am doing wrong.

CREATE TABLE tbl1 (ID int)
INSERT INTO tbl1 SELECT 1
CREATE TABLE tbl2 (ID int)
INSERT INTO tbl2 SELECT 2

CREATE PROCEDURE QOTD (@source INT)
AS 
BEGIN
 IF @source = 1 
 SELECT ID INTO #tmpID FROM tbl1 
 ELSE
 SELECT ID INTO #tmpID FROM tbl2 

 SELECT ID FROM #tmpID
END

ERROR:There is already an object named
‘#tmpID’ in the database.

Answer 1

Sometimes the T-SQL compiler gets confused, and doesn’t realise that only one side of an IF would be followed.

CREATE PROCEDURE QOTD (@source INT)
AS 
BEGIN
 CREATE TABLE #tmpID(ID int)
 IF @source = 1 
 INSERT INTO #tmpID SELECT ID FROM tbl1 
 ELSE
 INSERT INTO #tmpID SELECT ID  FROM tbl2 

 SELECT ID FROM #tmpID
END