Question

我在SQL 2005中有一个表，我希望聚合数据，这是一个例子。

JobName       ProductionCounter       StartDate             EndDate               CounterName        Stage
----------------------------------------------------------------------------------------------------------

200           23                      2012-08-30 13:45:00                          Kilograms          Final
200           2                       2012-08-30 13:45:00                          Bars               Final
    [...]
200           46                      2012-08-30 13:45:00   2012-08-30 17:23:00    Kilograms          Final
200           4                       2012-08-30 13:45:00   2012-08-30 17:23:00    Bars               Final
300           20                      2012-08-30 13:45:00                          Kilograms          1st
300           10                      2012-08-30 18:12:00                          Bars               1st
    [...]
300           40                      2012-08-30 18:12:00   2012-08-30 19:17:00    Kilograms          1st
300           20                      2012-08-30 18:12:00   2012-08-30 19:17:00    Bars               1st

I want to format this into the following


JobName      TotalKilos       TotalBars       StartDate             EndDate               Stage
-----------------------------------------------------------------------------------------------

200          69               6               2012-08-30 13:45:00   2012-08-30 17:23:00   Final
300          60               30              2012-08-30 18:12:00   2012-08-30 19:17:00   1st

这让我意识到我对SQL一无所知。我尝试了以下作为开始

SELECT JobName, SUM(KiloCounter)
FROM vwOeeInterval
GROUP BY JobName

SELECT JobName, SUM(BarCounter)
FROM vwOeeInterval
GROUP BY JobName

我的问题是：

如何将这些组合成一个查询？
如何查询StartDate和Stage等列？特别是结束日期在作业完成之前没有填写？

任何指针都会非常感激。

Answer 1

这是一个简单的聚合查询。您只需添加所需的字段：

SELECT JobName, SUM(KiloCounter) as TotalKilos,
       sum(BarCounts) as TotalBars,
       min(StartDate) as StartDate,
       max(EndDate) as EndDate,
       max(Stage) as Stage 
FROM vwOeeInterval
GROUP BY JobName

我假设您知道具有相同作业的所有行的StartDate，EndDate和Stage相同或为NULL。聚合将忽略NULL值。

Answer 2

当您尝试首先根据作业名然后反对获取总和时，您应该根据这两列进行分组。

请勿忘记选择

分组的两列

样本看起来像这样 -
Select column1, column2, sum(column3) from tablename
where blah blah blah...
group by column1, column2

如何组合聚合SQL查询和普通查询？

2 个答案: