Question

SELECT SUM(Marks) AS tot
FROM [Tbl_Results]
WHERE [month] = 'Mar'
    AND [year] = '2016'
GROUP BY sname

以上查询的输出我想传递给另一个查询，说明最大的“标记”

select MAX(?)  from [Tbl_Results]  
? how to pass an argument to get an max of marks from the table

Answer 1

有很多方法可以做到这一点您可以在第一个查询中创建cte，如下所示：

;WITH cte AS
(
    SELECT SUM(Marks) AS tot
    FROM [Tbl_Results]
    WHERE [month] = 'Mar'
    AND [year] = '2016'
    GROUP BY sname
)

SELECT MAX(tot)  
FROM cte

或者你可以从中创建一个视图：

CREATE VIEW vwTot 
AS

    SELECT SUM(Marks) AS tot
    FROM [Tbl_Results]
    WHERE [month] = 'Mar'
    AND [year] = '2016'
    GROUP BY sname
GO

SELECT MAX(tot)  
FROM vwTot

您还可以将结果插入临时表：

SELECT SUM(Marks) AS tot INTO #Temp
FROM [Tbl_Results]
WHERE [month] = 'Mar'
AND [year] = '2016'
GROUP BY sname

SELECT MAX(tot)  
FROM #Temp

或者将其用作派生表：

SELECT MAX(tot)  
FROM (
    SELECT SUM(Marks) AS tot
    FROM [Tbl_Results]
    WHERE [month] = 'Mar'
    AND [year] = '2016'
    GROUP BY sname
) dt

Answer 2

您可以将较旧的样式和select第一组结果放入临时表中。如果您需要对该中间结果集执行其他操作，这将非常有用。例如：

SELECT SUM(Marks) AS tot
INTO #results
FROM [Tbl_Results]
WHERE [month] = 'Mar'
    AND [year] = '2016'
GROUP BY sname

SELECT MAX(tot)
FROM #results

DROP TABLE #results

或者，您可以使用更新的样式并使用Common Table Expression在单个查询中获得结果：

;WITH cte AS (
    SELECT SUM(Marks) AS tot
    FROM [Tbl_Results]
    WHERE [month] = 'Mar'
        AND [year] = '2016'
    GROUP BY sname)
SELECT MAX(tot)
FROM cte;

Answer 3

您可以使用子查询。因为你正在使用groupby子句，所以你还需要在你的select语句中添加sname。

select MAX(tot)  from 
(
    SELECT  sname, SUM(Marks) AS tot
    FROM [Tbl_Results]
    WHERE [month] = 'Mar'
    AND [year] = '2016'
    GROUP BY sname
) b

如何将一个查询的（元素数组）输出发送到另一个查询

3 个答案: