INSERT INTO .. ON DUPLICATE KEY UPDATE for multiple items

Question

I want to do something like this

INSERT INTO t (t.a, t.b, t.c) 
VALUES (\'key1\',\'key2\',\'value\') 
ON DUPLICATE KEY UPDATE 
t.c = \'value\';
INSERT INTO          


        

Answer 1

Use the VALUES() function

INSERT INTO t (t.a, t.b, t.c)
VALUES ('key1','key2','value'), ('key1','key3','value2')
ON DUPLICATE KEY UPDATE
t.c = VALUES(t.c)

see http://dev.mysql.com/doc/refman/5.0/en/insert-on-duplicate.html