Question

我是sql的新手，遇到了一个小问题。我的查询是这样的：

select cust_id, count(1) from all_customers
group by cust_id
having count(1)>4;

该查询为我提供了我想要的结果。

我需要对all_customers表中的所有客户进行新查询，并从上面的查询中排除我刚刚得到的结果。我尝试过这样的事情：

select * from all_customers
where cust_id NOT IN 
(
    select cust_id, count(1) from all_customers
    group by cust_id
    having count(1)>4
)

但是我收到错误消息too many values。我做错了什么？

Answer 1

您应该删除NOT IN子句中的聚合列。原因是您只是比较cust_id列。另请注意，使用NOT IN时，子查询应始终返回单列。

select * 
from all_customers
where cust_id NOT IN 
      (
         select cust_id 
         from all_customers
         group by cust_id
         having count(1)>4
      )

Answer 2

子查询中有很多列，请尝试：

select * from all_customers
where cust_id NOT IN 
(select cust_id
 from all_customers
 group by cust_id
 having count(1)>4)

使用NOT IN提取数据

2 个答案: