mysql 批量刪除之大坑

首選先看看這條語句

DELETE  FROM
  tb_task t 
WHERE t.`groupname` = 'xxx' 
  AND t.`create_time` > '2013-08-20 14:24:00' 
  AND t.`filter` IS NULL 

這句代碼在sql裏會報錯， 因爲 tb_task 取了別名 因此，須要在 delete 和from中間 加上別名 t.

詳見最後個答案 [http://stackoverflow.com/questions/4471277/mysql-delete-from-with-subquery-as-condition]  

mysql manual [http://dev.mysql.com/doc/refman/5.5/en/delete.html]