Does SQL Server Offer Anything Like MySQL's ON DUPLICATE KEY UPDATE

Question

In MySQL, if you specify ON DUPLICATE KEY UPDATE and a row is inserted that would cause a duplicate value in a UNIQUE index or PRIMARY KEY, an UPDATE of the old row is performed. For example, if column a is declared as UNIQUE and contains the value 1, the following two statements have identical effect:

INSERT INTO table (a,b,c) VALUES (1,2,3)
  ON DUPLICATE KEY UPDATE c=c+1;

UPDATE table SET c=c+1 WHERE a=1;

I don't believe I've come across anything of the like in T-SQL. Does SQL Server offer anything comparable to MySQL's ON DUPLICATE KEY UPDATE?

user_146798 · Answer

There's no DUPLICATE KEY UPDATE equivalent, but MERGE and WHEN MATCHED might work for you

Inserting, Updating, and Deleting Data by Using MERGE

user_1486418 · Answer

You can try the other way around. It does the same thing more or less.

UPDATE tablename 
SET    field1 = 'Test1', 
       field2 = 'Test2' 
WHERE  id = 1 

IF @@ROWCOUNT = 0 
  INSERT INTO tablename 
              (id, 
               field1, 
               field2) 
  VALUES      (1, 
               'Test1', 
               'Test2')

shahkalpesh_23574 · Answer

SQL Server 2008 has this feature, as part of TSQL.
See documentation on MERGE statement here - http://msdn.microsoft.com/en-us/library/bb510625.aspx

user_109103 · Answer

SQL server 2000 onwards has a concept of instead of triggers, which can accomplish the wanted functionality - although there will be a nasty trigger hiding behind the scenes.

Check the section "Insert or update?"

http://msdn.microsoft.com/en-us/library/aa224818(SQL.80).aspx

Does SQL Server Offer Anything Like MySQL's ON DUPLICATE KEY UPDATE

5 Answers