Question

I have such a query:

UPDATE `user` 
SET mail='abc@abc' 
WHERE id = 
    IF((SELECT admin FROM user WHERE id = '1') > 2, 
       (SELECT id FROM user WHERE id='2'), 
       (SELECT id FROM user WHERE id = '1')
      )

as a result I get error message:

“You can’t specify target table ‘user’ for update in FROM clause”

I want tu update column named ‘mail’ in all rows from ‘user’ table where ‘id’ of row is 1 or 2 depending on value of another column named ‘admin’. Please help with corect syntax.

Answer 1

UPDATE `user`
SET email='abc@abc'
WHERE id = (SELECT id FROM (SELECT IF((SELECT admin FROM user WHERE id = '1') > 2,
                                      (SELECT id FROM user WHERE id = '2'),
                                      (SELECT id FROM user WHERE id = '1')) AS id
                           ) AS t
           );