Question

我有一个查询，在下面的示例中工作正常

    Select t2.leadno
    , t1.quoteno
    , t1.cn_ref
    , sum(t1.qty/100)
    , ROW_NUMBER() Over (Partition By t2.leadno order by sum(qty/100) desc) as RN 
From dba.quotelne as t1 
    LEFT JOIN dba.quotehdr as t2 ON t1.quoteno = t2.quoteno
Where leadno = 31665 
    and t1.statusflag = 'A' 
    and t2.statusflag = 'A' 
Group By t2.leadno
    , t1.quoteno
    , t1.cn_ref

一旦我告诉尝试过滤这个只显示RN = 1，如下所示它给我一个错误

“无效使用聚合函数”

Select t2.leadno
    , t1.quoteno
    , t1.cn_ref
    , sum(t1.qty/100)
    , ROW_NUMBER() Over (Partition By t2.leadno order by sum(qty/100) desc) as RN 
From dba.quotelne as t1 
    LEFT JOIN dba.quotehdr as t2 ON t1.quoteno = t2.quoteno
Where leadno = 31665 
    and t1.statusflag = 'A' 
    and t2.statusflag = 'A'
    and RN = 1
Group By t2.leadno
    , t1.quoteno
    , t1.cn_ref

我所做的就是将RN = 1添加到where语句中，我缺少什么？

我正在使用Adaptive Server Anywhere 9.0

Answer 1

我想你想要：

Select Top 1 t2.leadno
    , t1.quoteno
    , t1.cn_ref
    , sum(t1.qty/100)
    , ROW_NUMBER() Over (Partition By t2.leadno order by sum(qty/100) desc) as RN 
From dba.quotelne as t1 
    LEFT JOIN dba.quotehdr as t2 ON t1.quoteno = t2.quoteno
Where leadno = 31665 
    and t1.statusflag = 'A' 
    and t2.statusflag = 'A'
Group By t2.leadno
    , t1.quoteno
    , t1.cn_ref
Order By RN

Answer 2

您无法在同一级别的SELECT中使用WHERE中定义的列别名。这与窗口函数无关。这是所有列的规则。所以，使用子查询：

select t.*
from (Select t2.leadno, t1.quoteno, t1.cn_ref, sum(t1.qty/100),
             ROW_NUMBER() Over (Partition By t2.leadno order by sum(qty/100) desc) as RN 
      From dba.quotelne t1 INNER JOIN
           dba.quotehdr t2
           ON t1.quoteno = t2.quoteno
      Where leadno = 31665 and t1.statusflag = 'A' and t2.statusflag = 'A' 
      Group By t2.leadno, t1.quoteno, t1.cn_ref
     ) t
where rn = 1;

注意：您的LEFT JOIN是不必要的，因为WHERE子句将其变为INNER JOIN。所以，我将其更改为INNER JOIN。

SUM（）OVER PARTITION BY - 无效使用聚合函数

2 个答案: