Question

表A：用户ID 名称

表B：accid 用户身份 ACCNO

表c：loanid 用户身份 AMT

嗨frnds，我想从表A中获取客户名称，从表B中获取accno，并且它们不包括在表c中。帮助我

Answer 1

SELECT a.name, b.accno
FROM a inner join b on b.userid = a.userid
where a.userid not in (select distinct userid from c)

这个查询怎么样我会认为这很好用

Answer 2

尝试：

SELECT a.name, b.accno
FROM tableA a 
JOIN tableB b on a.userid = b.userid
LEFT JOIN tableC c on a.userid = c.userid
WHERE c.userid IS NULL

执行左连接并检查返回的值是否为空，检查表c中是否有记录表a和b中的记录。

Answer 3

解决方案1：

;with cte as
(Select a.name,b.accno,a.userid
from tableA a
join tableB b
on a.userid = b.userid)

select x.name,x.accno
from cte x 
where x.userid not in (select userid from tableC)

解决方案2：

;with cte as
(Select a.name,b.accno,a.userid
from tableA a join tableB b 
on a.userid = b.userid)
select x.name,x.accno
from cte x 
where x.userid in(select c.userid 
                 from cte c 
                 except 
                 select tc.userid 
                from tableC tc)

解决方案3

;with cte as
(Select a.name,b.accno,a.userid
from tableA a join tableB b 
on a.userid = b.userid)

select x.name,x.accno
from cte x
left join tableC tc
on x.userid = tc.userid
where tc.userid is null

用于连接3个表的SQL查询

3 个答案: