MYSQL update with WHERE SELECT subquery error

Question

I have an issue with getting select sub-queries to work on an UPDATE. I\'m trying something like the following:

UPDATE foo
   SET bar=bar-1
 WHE         


        

Answer 1

In some cases you can also take advantage of the MySQL variable. e.g.:

SET @id1 = (SELECT id FROM foo WHERE name = 'parent');
UPDATE foo SET parent_id = @id1 WHERE name = 'emails';