Question

View获取前三列。我需要在视图中再添加一列（totalCount）来获取总计数：

CId CCId CCount  totalCount
1      a      3         6
1      a      3         6
1      b      3         6
1      c      3         6
2      b      2         6
2      b      2         6
2      a      2         6
2      a      2         6
3      v      1         6

如何将totalCount设为6？

（Cid的业务规则= 1 Ccount = 3 Cid = 2 Ccount = 2 Cid = 3 Ccount = 1因此totalCount = 3 + 2 + 1 = 6）

Answer 1

SELECT  a.CID, a.CCID, a.CCOUNT,
        b.TotalCount
FROM    Table1 a, (SELECT SUM(DISTINCT cCOunt) TotalCount 
                   FROM Table1) b

SQLFiddle Demo

<强>更新

Andomar在评论中指出，已对查询进行了更新，

SELECT  a.CID, a.CCID, a.CCOUNT,
        b.TotalCount
FROM    Table1 a, 
(
  SELECT SUM(TotalCount) TotalCount
  FROM
  (
      SELECT MAX(cCOunt) TotalCount 
      FROM Table1
      GROUP BY CId
   ) c
) b

SQLFiddle Demo

Answer 2

使用此代码，我得到了预期的结果：

select CId
      ,CCId
      ,CCount
      ,(select SUM(a.tcount) 
          from (select distinct CId ,CCount as tcount
       from  dbo.Test) as a ) totalcount
from dbo.Test

Answer 3

根据您的示例数据，我假设Cid只能有一个（可能是重复的）CCount值。在这种情况下，您可以使用max和group by选择一个随机的（sum）：

select  sum(OneCCCount) as TotalCount
from    (
        select  max(CCount) as OneCCCount
        from    YourTable
        group by
                CId
        ) as SubQueryAlias

获得计数总和

3 个答案: