Performing an UPDATE or INSERT depending whether a row exists or not in MySQL

Question

In MySQL, I\'m trying to find an efficient way to perform an UPDATE if a row already exists in a table, or an INSERT if the row doesn\'t exist.

I\'ve found two possi

Answer 1

There is another way - REPLACE.

REPLACE INTO myTable (col1) VALUES (value1)

REPLACE works exactly like INSERT, except that if an old row in the table has the same value as a new row for a PRIMARY KEY or a UNIQUE index, the old row is deleted before the new row is inserted. See Section 12.2.5, “INSERT Syntax”.