我不知道如何删除属于特定文件的单词。我正在尝试删除属于fileId为42的文件的单词。有人认为他们能帮我吗？
Table file
fileId - Primary Key
fileName - Normal column.
fileUrl - Normal column.
Table fileWord
fileId, wordId - Primary Key, Foreign Key
count - Normal column.
Table word
wordId - Primary Key
word - Normal Column
我的SQL：
DELETE words
FROM files f, fileword fw, words w
WHERE 42 = fw.fileId AND fw.wordId = w.wordId;
最佳答案
试试这个：
DELETE f FROM files as f
inner join fileword as fw on f.fileId = fw.wordId
inner join words as w on f.fileId = w.wordId
WHERE f.fileId = 42
如果要从单词表中删除单词，则
DELETE w FROM files as f
inner join fileword as fw on f.fileId = fw.wordId
inner join words as w on fw.wordId = w.wordId
WHERE f.fileId = 42