you cant specify target table code example
Example 1: update you can't specify target table for update in from clause
UPDATE myTable
SET myTable.A =
(
SELECT B
FROM (SELECT * FROM myTable) AS something
INNER JOIN ...
)
Example 2: mysql #1093 - You can't specify target table error
DELETE FROM story_category
WHERE category_id NOT IN (
SELECT cid FROM (
SELECT DISTINCT category.id AS cid FROM category
INNER JOIN story_category ON category_id=category.id
) AS c
)