Question

如果我有这张表

PID     Phase   CtrlDollars       ActualDollars
-----------------------------------------------
1        A          25.00              50.00
1        B          10.00              23.00
1        c          2.00               14.00
2        A          24.00              24.00
2        B          10.00              20.00

我怎样才能写一个选择给我一个

Total for the Actual Dollars for each PID (TotalActDollsForPID)

但仍然显示详细信息（这是客户想要的）

PID     Phase    CtrlDollars      ActualDollars    TotalActDollsForPID
----------------------------------------------------------------------
1        A          25.00              50.00             87.00
1        B          10.00              23.00             87.00
1        c          2.00               14.00             87.00
2        A          24.00              24.00             44.00
2        B          10.00              20.00             44.00

Answer 1

使用子查询：

SELECT p.PID, 
       p.PHASE, 
       p.CtrlDollars, 
       p.ActualDollars, 
       t.TotalActDollsForPID
FROM mytable p
INNER JOIN
    (SELECT PID, 
            SUM(ActualDollars) AS TotalActDollsForPID 
     FROM mytable GROUP BY PID) AS t
ON t.PID = p.PID

Answer 2

如果您有SQL Server 2005+，则可以使用the OVER() clause。

SELECT PID,
    Phase,
    CtrlDollars,
    ActualDollars,
    SUM(ActualDollars) OVER(PARTITION BY PID) AS "TotalActDollsForPID"
FROM MyTable

Answer 3

除了使用子查询和窗口函数之外，另一个选项是使用apply：

SELECT
    PID,
    Phase,
    CtrlDollars,
    ActualDollars,
    TotalActDollsForPID 
FROM Table1 t
OUTER APPLY (
    SELECT 
        SUM(actualdollars) AS TotalActDollsForPID 
    FROM Table1 
    WHERE PID = t.PID 
    GROUP BY pid
) oa

它可能会提供更好的性能（或者不是，ymmv）。

SQL使用总计列选择详细信息

3 个答案: