左连接删除查询

Question

我的mysql查询有问题.. 查询是：

DELETE address_book.*, address_book_tags.*, address_book_tags_contacts.* from address_book, address_book_tags, address_book_tags_contacts
            LEFT JOIN address_book_tags_contacts on address_book.id = address_book_tags_contacts.contactId 
            LEFT JOIN address_book_tags on address_book_tags_contacts.tagId = address_book_tags.id
    WHERE address_book.idVitalStatistic=1;

错误是：

  

RuntimeException'，带有消息'Not unique table / alias：'address_book_tags_contacts'（1066）'

我该怎么办？

Answer 1

你在FROM中有一个表address_book_tags_contacts和address_book_tags，就像LEFT JOIN一样。如果这是故意的（我不这么认为），你必须给他们一个独特的名字。但我想你应该从FROM子句中删除这些表名。

Answer 2

address_book_tags_contacts 需要别名，就像这样;）

DELETE address_book.*, abt1.*, abtc1.*
FROM
  address_book, address_book_tags abt1, address_book_tags_contacts abtc1
  LEFT JOIN address_book_tags_contacts abtc2 ON ...
  LEFT JOIN address_book_tags abt2 ON ...

@Steve这个查询实际上要删除什么。

Answer 3

address_book_tags, address_book_tags_contacts出现两次。

删除重复的：

DELETE address_book.*, address_book_tags.*, address_book_tags_contacts.* 
from address_book
    LEFT JOIN address_book_tags_contacts on address_book.id = address_book_tags_contacts.contactId 
    LEFT JOIN address_book_tags on address_book_tags_contacts.tagId = address_book_tags.id
WHERE address_book.idVitalStatistic=1;

Answer 4

尝试：

DELETE address_book, address_book_tags, address_book_tags_contacts from address_book
            LEFT JOIN address_book_tags_contacts on address_book.id = address_book_tags_contacts.contactId 
            LEFT JOIN address_book_tags on address_book_tags_contacts.tagId = address_book_tags.id
    WHERE address_book.idVitalStatistic=1;