在MySQL中加入两个子查询

Question

我在MySQL的联合两个子查询中遇到问题,例如

(select * from table1 where id = 1 group by f1) a1 
join 
(select * from table2 where id = 2 group by f2) a2 ON  a1.f3 = a2.f3;

错误1064(42000):您的SQL语法有错误; 查看与您的MySQL服务器版本对应的手册,以便在第1行'join(select*from table1 where id = 2)'附近使用正确的语法

我的语法不正确吗？

Answer 1

查看一些示例

SELECT * FROM table1, table2;

SELECT * FROM table1 INNER JOIN table2 ON table1.id=table2.id;

SELECT * FROM table1 LEFT JOIN table2 ON table1.id=table2.id;

SELECT * FROM table1 LEFT JOIN table2 USING (id);