Question

我想从数据库中删除某些项目。我有以下查询：

SELECT * 
FROM sheets, entries 
WHERE entries.sheetID = sheets.id AND sheets.clientID = 13

这样可以，并返回2个结果。

现在我想将此SELECT查询转换为DELETE查询。但是，以下内容不起作用：

DELETE FROM sheets, entries 
WHERE entries.sheetID = sheets.id AND sheets.clientID = 13

MySQL抛出以下错误：

1064 - 您的SQL语法出错;检查手册对应于您的MySQL服务器用于正确语法的版本靠近'WHERE entries.sheetID = sheets.id AND sheets.clientID = 13'at 第1行

我在这里做错了什么？

Answer 1

MySQL 4及更高版本支持deleting from multiple tables at once，使用以下语法：

DELETE sheets, entries
FROM sheets, entries 
WHERE entries.sheetID = sheets.id AND sheets.clientID = 13

如果您使用的是低于版本4的MySQL，那么您需要一次从一个表中删除行，并且可以使用此处发布的其他解决方案之一。

Answer 2

试

DELETE sheets, entries 
FROM sheets, entries
WHERE entries.sheetID = sheets.id AND sheets.clientID = 13

我一次用2个表格搜索SQL删除，找到了this forum post

Answer 3

MySQL允许你删除一个连接，但你必须指定哪些列，所以使用你的例子，正确的语法将是

DELETE sheets.*, entries.* FROM sheets, entries WHERE entries.sheetID = sheets.id AND sheets.clientID = 13

Answer 4

你可以尝试这样的事吗

DELETE FROM sheets
FROM sheets, entries 
WHERE entries.sheetID = sheets.id AND sheets.clientID = 13

如果要从工作表中删除

DELETE FROM entries
FROM sheets, entries 
WHERE entries.sheetID = sheets.id AND sheets.clientID = 13

如果来自条目

Answer 5

我相信你一次只能从一张桌子DELETE。

DELETE FROM entries
WHERE entries.sheetID IN
(SELECT ID FROM sheets WHERE clientID = 13)

DELETE FROM sheets
WHERE sheets.clientID = 13

Answer 6

您一次只能从一个表中删除。如果要同时从同一查询中删除两个删除操作，可以执行以下操作：

DELETE from sheets where id in (
SELECT sheets.id
FROM sheets, entries 
WHERE entries.sheetID = sheets.id AND sheets.clientID = 13);
DELETE from entries where id in (
SELECT entries.id
FROM sheets, entries 
WHERE entries.sheetID = sheets.id AND sheets.clientID = 13);

如何将此MySQL SELECT查询转换为DELETE查询？

6 个答案: