Question

我的数据库中有以下表格

表用户

 user_id            phone 

    1          2222222222
    1          3333333333
    2          1111111111
    2          4444444444
    2          5555555555
    3          6666666666
    3          7777777777

表users_phone

 user_id     full_name          phone1           phone2           phone3
    1          user1          2222222222       3333333333     
    2          user2          1111111111       4444444444        5555555555
    3          user3          6666666666       7777777777

创建一个为每个用户添加电话列的SQL语句，我希望我的SELECT语句返回以下内容：

select * from 
(select phone1 from users_phone as P
,(select phone2 from users_phone)as P 
(select phone3 from users_phone)as P)from users as U
where U.user_id=P.user_id

我试图创建一个执行以下操作的SQL语句，但显然失败了。

就我已经试图解决这个问题而言，这里已经有了。

close.onclick = function(){
    checker('id'); // <-- are you sure you want to pass static string here?
};

我一直在融化我的大脑，试图弄清楚如何在查询中做甚至可以做任何帮助都会非常感激！

Answer 1

在SQl Server中，我会使用with和row_number来执行此操作：像那样：

;with cte as (
    select u.userId,
    p.phone, row_number() over (partition by u.userId order by u.userId)  as rn
    from @tb1 u
    join @tb2 p on u.userId = p.userId )

 select u.Userid, u.name, 
    (select cte.phone from cte where cte.userId = u.UserId and cte.rn = 1) as phone1,
    (select cte.phone from cte where cte.userId = u.UserId and cte.rn = 2) as phone2,
    (select cte.phone from cte where cte.userId = u.UserId and cte.rn = 3) as phone3
    from @tb1 u

Print script result

具有复杂语句的sql查询

1 个答案: