Question

如何找到列的总和，例如。 'PlanTotal'按另一列的日期或月份，例如。 'PlanStartDate'在过去六个月内？

我已经达到了这个目标，但不知道如何将总和分成几天或几个月。

SELECT SUM(PlanTotal) as PlanTotal
FROM TEST.dbo.Plans
WHERE DATEDIFF(MONTH, cast(cast(PlanStartDate as varchar(8)) as datetime), GETDATE()) <= 6

由于

.....

我用过

SELECT SUM(PlanTotal) as PlanTotal,PlanStartDate
FROM TEST.dbo.Plans
WHERE  DATEDIFF(MONTH, cast(cast(PlanStartDate as varchar(8)) as datetime), GETDATE()) <= 6
GROUP BY PlanStartDate
ORDER BY PlanStartDate

这会按个人日显示Plan Total和PlanStartDate，但我似乎仍然无法在每个月进行分组。

如果我这样做：

SELECT SUM(PlanTotal) as PlanTotal,MONTH(PlanStartDate)
FROM TEST.dbo.Plans
WHERE  DATEDIFF(MONTH, cast(cast(PlanStartDate as varchar(8)) as datetime), GETDATE()) <= 6
GROUP BY MONTH(PlanStartDate)
ORDER BY PlanStartDate

使用月份组，它只会抛出错误;

Column "TEST.dbo.Plans.PlanStartDate" is invalid in the ORDER BY clause because
it is not contained in either an aggregate function or the GROUP BY clause.

我该如何纠正？

Answer 1

以下内容应该有所帮助，但是它不会显示PlanStartDate列中不存在的日期的任何记录

SELECT SUM(PlanTotal) as PlanTotal
       ,PlanStartDate
FROM TEST.dbo.Plans
WHERE DATEDIFF(MONTH, cast(cast(PlanStartDate as varchar(8)) as datetime), GETDATE())<= 6
Group By PlanStartDate

按天/月查找列数

1 个答案: