Equivalent of MySQL ON DUPLICATE KEY UPDATE in Sql Server

Question

I am trying to find an equivalent of the following MySql query in Sql Server (2012)?

INSERT INTO mytable (COL_A, COL_B, COL_C, COL_D)
VALUES ( \'VAL_A\',\'VA         


        

Answer 1

Stored Procedure will save the day.

Here I assume that COL_A and COL_B are unique columns and are type of INT NB! Don't have sql-server instance ATM so cannot guarantee correctness of the syntax. UPDATE! Here is a link to SQLFIDDLE

 CREATE TABLE mytable
(
COL_A int UNIQUE,
COL_B int UNIQUE,
COL_C int,
COL_D int,
)

GO

INSERT INTO mytable (COL_A, COL_B, COL_C, COL_D)
VALUES (1,1,1,1),
(2,2,2,2),
(3,3,3,3),
(4,4,4,4);
GO

CREATE PROCEDURE updateDuplicate(@COL_A INT, @COL_B INT, @COL_C INT, @COL_D INT)
AS
BEGIN
    DECLARE @ret INT
    SELECT @ret = COUNT(*) 
    FROM mytable p 
    WHERE p.COL_A = @COL_A 
        AND p.COL_B = @COL_B

     IF (@ret = 0) 
        INSERT INTO mytable (COL_A, COL_B, COL_C, COL_D)
        VALUES ( @COL_A, @COL_B, @COL_C, @COL_D)

     IF (@ret > 0)
        UPDATE mytable SET COL_D = @COL_D WHERE col_A = @COL_A AND COL_B = @COL_B  
END;
GO

Then call this procedure with needed values instead of Update statement

exec updateDuplicate 1, 1, 1, 2
GO
SELECT * from mytable
GO