Question

我有一个包含3列的表（MyTable）;数量，线，金额。
如果Number在3个以上的记录中相同，我想返回按Number分组的记录。否则我想要按数字和行分组的所有其他记录。

这是我到目前为止所得到的。它给出了一个错误，因为Line需要在聚合函数中

select * (
select Number, (case when count(Line) > 3 then -1 else Line end) as Line2, sum(Amount)
from MyTable
group by Number, Line2
) as x
order by x.Number

MyTable看起来像这样：

Number    Line    Amount
------------------------
1         1       100
1         1       100
1         2       200
1         2       200
2         1       150
2         1       150
3         1       300
3         2       350

我希望结果看起来像这样：

Number    Line2   Amount
------------------------
1         -1      600    <- More than 3 lines
2         1       300    <- Grouped by Line
3         1       300    
3         2       350

Answer 1

试试这个：

SELECT Number, -1 AS Line, SUM(Amount) AS Amount
FROM mytable
GROUP BY Number 
HAVING COUNT(*) > 3

UNION 

SELECT Number, Line, SUM(Amount) AS Amount
FROM mytable
WHERE Number NOT IN (SELECT Number
                     FROM mytable
                     GROUP BY Number 
                     HAVING COUNT(*) > 3)
GROUP BY Number, Line

Answer 2

您可以像这样使用CTE：

DECLARE @t table
(Number int,Line int,Amount int)

INSERT @t VALUES
  (1,1,100),(1,1,100),(1,2,200),
  (1,2,200),(2,1,150),(2,1,150),
  (3,1,300),(3,2,350)

;WITH CTE as
(
  SELECT 
    Number, Line, Amount, 
    count(*) over (partition by number) cnt
FROM @t
)
SELECT
  Number, 
  CASE WHEN cnt < 3 THEN Line ELSE -1 END Line2,
  SUM(Amount) Amount
FROM CTE
GROUP BY number, CASE WHEN cnt < 3 THEN Line ELSE -1 END

结果：

Number  Line    Amount
1       -1      600
2       1       300
3       1       300
3       2       350

Group By Count和同一查询中的字段

2 个答案: