Question

我想获得行的总结果。例如，如果数据库有10条记录，那么输出应为10。

我的查询是

select COUNT(*) AS NumberRow from
(SELECT TOP 30 PERCENT [EmpName], sum(Scoring) as GrandTotal
FROM [masterView] GROUP BY [EmpName] 
ORDER BY GrandTotal DESC,EmpName ASC)

但是有一个错误： -

错误是：

消息102，级别15，状态1，行4'''附近的语法不正确。

Answer 1

您应该使用子查询别名：

SELECT  COUNT(*) AS NumberRow
FROM    ( SELECT TOP 30 PERCENT
                    [EmpName] ,
                    SUM(Scoring) AS GrandTotal
          FROM      [masterView]
          GROUP BY  [EmpName]
          ORDER BY  GrandTotal DESC ,
                    EmpName ASC
        ) t

您可以使用窗口函数将数据与聚合混合：

SELECT  *, COUNT(*) OVER() AS NumberRow
FROM    ( SELECT TOP 30 PERCENT
                    [EmpName] ,
                    SUM(Scoring) AS GrandTotal
          FROM      [masterView]
          GROUP BY  [EmpName]
          ORDER BY  GrandTotal DESC ,
                    EmpName ASC
        ) t

Answer 2

别名的东西肯定会像Giorgi上面提到的那样起作用。但是，如果您的数据库有10条Employees记录，那么当您选择TOP 30 PERCENT时，您的查询将只返回3条记录而不是10条记录。以下查询应返回10条记录。

select COUNT(*) AS NumberRow from
(   SELECT [EmpName], sum(Scoring) as GrandTotal
    FROM [masterView] GROUP BY [EmpName] 
    ORDER BY GrandTotal DESC,EmpName ASC
)temp

SQL获取输出总数

2 个答案: