如何在同一查询中使用 Count 和 Sum？答案

【问题标题】：How to use Count and Sum in the Same Query?如何在同一查询中使用 Count 和 Sum？
【发布时间】：2012-05-10 11:20:10
【问题描述】：

我使用聚合函数“SUM”编写了以下查询。

SELECT 
       D.PODetailID, 
       SUM(D.AcceptedQty) 
FROM STR_MRVDetail D 
INNER JOIN STR_MRVHeader H ON H.MRVID = D.MRVID 
INNER JOIN PUR_POHeader PH ON PH.POID = H.POID 
INNER JOIN PUR_PODetail PD ON PD.PODetailID = D.PODetailID
WHERE H.StatusID = 4
AND PH.POID = 839
AND (SELECT 
           SUM(AcceptedQty) 
     FROM 
           STR_MRVDetail 
     WHERE 
           STR_MRVDetail.PODetailID = PD.PODetailID) = 
                              (SELECT POQuantity FROM PUR_PODetail 
                               WHERE PUR_PODetail.PODetailID = PD.PODetailID)
                               GROUP BY D.PODetailID

目前此查询返回 2 行。我想检索此查询的计数。上述查询的行数如何计算？

【问题讨论】：

所以您想将计数（在本例中为 2）作为单独的列？
不，我不想展示。我只想计算行数并将行数分配给一个整数变量。
你的编程语言应该有办法获取检索到的行数（或者只是在显示它们时计算它们）
我需要获取检索到的行数
执行查询后，返回的行数会在@@RowCount中得到。

标签： sql-server sql-server-2008 count sum aggregate

【解决方案1】：

您可以将@@ROWCOUNT 添加到查询中，这还会为您提供最终结果集以及结果集中所有行的计数。

SELECT D.PODetailID, SUM(D.AcceptedQty), @@ROWCOUNT FROM STR_MRVDetail D  
INNER JOIN STR_MRVHeader H ON H.MRVID = D.MRVID  
INNER JOIN PUR_POHeader PH ON PH.POID = H.POID  
INNER JOIN PUR_PODetail PD ON PD.PODetailID = D.PODetailID 
WHERE H.StatusID = 4 
AND PH.POID = 839 
AND (SELECT SUM(AcceptedQty) FROM STR_MRVDetail  
     WHERE STR_MRVDetail.PODetailID = PD.PODetailID) =  
     (SELECT POQuantity FROM PUR_PODetail  
      WHERE PUR_PODetail.PODetailID = PD.PODetailID) 
GROUP BY D.PODetailID

【讨论】：

【解决方案2】：

SELECT COUNT(*) as Total_Rows
FROM
(
SELECT D.PODetailID as PODetailID, SUM(D.AcceptedQty) as Total_AcceptedQty
FROM STR_MRVDetail D 
INNER JOIN STR_MRVHeader H ON H.MRVID = D.MRVID 
INNER JOIN PUR_POHeader PH ON PH.POID = H.POID 
INNER JOIN PUR_PODetail PD ON PD.PODetailID = D.PODetailID
WHERE H.StatusID = 4
AND PH.POID = 839
AND (SELECT SUM(AcceptedQty) FROM STR_MRVDetail 
     WHERE STR_MRVDetail.PODetailID = PD.PODetailID) = 
     (SELECT POQuantity FROM PUR_PODetail 
      WHERE PUR_PODetail.PODetailID = PD.PODetailID)
GROUP BY D.PODetailID
) as t

【讨论】：