Question

I want to write query like this:

SET @id := 0;
UPDATE table1
SET
    field1 = @id + 1,
    @id := @id + 1

And get error message:

#1064 - You have an error in your SQL syntax; check the manual that
corresponds to your MySQL server version for the right syntax to use
near '@id := @id + 1' at line 3 

How write this query correctly?

Answer 1

You can do it like this, with the assignment and increment combined:

SET @id := 0;
UPDATE table1
SET
    field1 = (@id := @id + 1)

EDIT: you can even use an ORDER BY on such an UPDATE query to specify the order in which the numbers should be assigned.