Question

此：

SELECT * 
  FROM tbl_playlists, tbl_playlistsongs 
 WHERE tbl_playlists.playlist_id = tbl_playlistsongs.playlist_id 
   AND tbl_playlists.playlist_id = 1

......没问题。但是：

DELETE from tbl_playlists, tbl_playlistsongs 
 WHERE tbl_playlists.playlist_id = tbl_playlistsongs.playlist_id 
   AND tbl_playlists.playlist_id = 1

...说我有语法错误。除了SELECT * vs DELETE之外，它们是相同的。它对我来说仍然具有完美的逻辑意义..但我必须遗漏一些东西！

Answer 1

传统SQL不支持多表删除，但MySQL 支持。这意味着您使用的是MySQL特定语法：

DELETE pl, pls
  FROM TBL_PLAYLISTS pl
  JOIN TBL_PLAYLISTSONGS pls ON pls.playlist_id = pl.playlist_id
 WHERE pl.playlist_id = 1

参考：

DELETE (MySQL documentation)

mysql删除语法与select有何不同？

1 个答案: