Question

SQL三表查询，a,b,c三张表。怎么能通过主表a的id，得到c表的信息呢？请高手写个sql语句

a.id = b.id，b.sid = c.sid

Answer 1

SELECT 表1.id, 表3.*
FROM (表1 INNER JOIN 表2 ON 表1.id = 表2.id) INNER JOIN 表3 ON 表2.sid = 表3.sid;

Answer 2

select c.* from c,b,a where a.id = b.id，b.sid = c.sid

Answer 3

select a.*,b.*,c.* from a left join b on a.id=b.id left join c on b.sid=c.sid