编写MySQL查询的更好方法(JOIN)

Question

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

编写此查询的正确方法是什么？它目前不起作用,因为子查询返回多行.

Answer 1

用途IN:

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