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CREATE PROCEDURE sprGetUserInfo
SET TRANSACTION ISOLATION LEVEL SERIALIZABLE;
IF NOT EXISTS(SELECT TOP 1 ID FROM table2 WHERE userid = @UserID)
--Insert first record
INSERT INTO table2 (userid,currentad_id)VALUES (@UserID,1)
UPDATE table2 SET currentad_id = currentad_id+1 WHERE userid = @UserID
SELECT table1.*, table2.currentad_id FROM table1 INNER JOIN table2 ON table1.userid = table2.userid WHERE table1.userid = @UserID
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INSERT YourTable(UserID, ID2)
SELECT TOP 1
SELECT @UserID, 1 ID2
SELECT TOP 1
@UserID, ID2 + 1
WHERE UserID = @UserID
ID2 DESC) x
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