编写此MySQL查询的更好方法（JOIN）

写这个查询的正确方法是什么？它当前不起作用，因为子查询返回多行。

您可以使用中的

执行此操作：

DELETE FROM table1
WHERE field1=(SELECT id FROM table2 WHERE type=1) 
OR field2=(SELECT id FROM table2 WHERE type=1)

delete
from table1
where field1 in (
        select id
        from table2
        where type = 1
        )
    or field2 in (
        select id
        from table2
        where type = 1
        )

您可以使用

中的

执行此操作：

DELETE FROM table1
WHERE field1=(SELECT id FROM table2 WHERE type=1) 
OR field2=(SELECT id FROM table2 WHERE type=1)

delete
from table1
where field1 in (
        select id
        from table2
        where type = 1
        )
    or field2 in (
        select id
        from table2
        where type = 1
        )

在

中使用

：

DELETE FROM table1
WHERE field1=(SELECT id FROM table2 WHERE type=1) 
OR field2=(SELECT id FROM table2 WHERE type=1)

delete
from table1
where field1 in (
        select id
        from table2
        where type = 1
        )
    or field2 in (
        select id
        from table2
        where type = 1
        )

在

中使用

：

DELETE FROM table1
WHERE field1=(SELECT id FROM table2 WHERE type=1) 
OR field2=(SELECT id FROM table2 WHERE type=1)

delete
from table1
where field1 in (
        select id
        from table2
        where type = 1
        )
    or field2 in (
        select id
        from table2
        where type = 1
        )

根据表的大小，您可能可以使用IN方法。如果它们在较大的一侧，您可以使用语法进行删除

DELETE FROM table1
WHERE field1 IN (SELECT id FROM table2 WHERE type=1) 
OR field2 IN(SELECT id FROM table2 WHERE type=1)

根据表的大小，您可能可以使用IN方法。如果它们在较大的一侧，您可以使用语法进行删除

DELETE FROM table1
WHERE field1 IN (SELECT id FROM table2 WHERE type=1) 
OR field2 IN(SELECT id FROM table2 WHERE type=1)