Comment la syntaxe mysql delete diffère-t-elle de select?

Question

Ce:

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

... fonctionne pas de problème. Mais:

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

... dit que j'ai une erreur de syntaxe. Ils sont identiques autres que SELECT * vs DELETE. Cela me semble toujours parfaitement logique ... mais il me manque quelque chose!

Answer 1

SQL traditionnel ne prend pas en charge les suppressions multi-tables, mais MySQL le fait. Cela signifie que vous utilisez MySQL syntaxe spécifique:

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

Référence:

• DELETE (MySQL documentation)