Question

问题：写一个查询来显示客户编号，名字，姓氏，这些客户的贷款总额最大，至少取自2个银行分行。

我已尝试过以下查询，但我收到此错误

Msg 8120，Level 16，State 1，Line 7
专栏＆＃39; customer.fname＆＃39;在选择列表中无效，因为它不包含在聚合函数或GROUP BY子句中。

代码：

with l as
(  
    select custid, sum(loan_amount) as tot 
    from loan
    group by custid 
    having count(bid) >= 2   
) 
select 
    concat(c.fname, c.ltname) as name,
    max(l.tot)
from 
    customer as c, l
where 
    l.custid = c.custid

Answer 1

您需要GROUP BY来选择聚合数据和非聚合数据，因此您需要决定数据的分组方式。你可以做任何一件事

SELECT CONCAT(c.fname,c.ltname) as name, MAX(l.tot)
FROM customer AS c
INNER JOIN l ON l.custid=c.custid
GROUP BY c.fname,c.ltname

或

SELECT CONCAT(c.fname,c.ltname) as name, MAX(l.tot)
FROM customer AS c
INNER JOIN l ON l.custid=c.custid
GROUP BY concat(c.fname,c.ltname)

请注意以下事项：

我将“旧”连接语法转换为更可接受的INNER JOIN语法
如果你要显示结果，你可能想要在名字和后期名称之间留一个空格。

如何使用WITH子句和select子句

1 个答案: