Question

我是sql的新手

这是我的疑问：

select rmname, sum(cast (PROPOSEDLIMIT as int)) as january
from los_ext 
where applicationdate between '01-01-2016' and '01-31-2016'
group by RMNAME

我想在单个查询中每个月使用此功能，而不必始终使用日期between function。

我该怎么做？

我希望输出为：

RMNAME   JAN   FEB   MARCH  APRIL   ....
Nitin    2222  3333  33333  34422   333

要求取出所提出的限额之和。

Answer 1

尝试以下查询：

select 
    rmname, 
    sum(CASE WHEN MONTH(applicationDate) = 1 THEN cast (PROPOSEDLIMIT as int) ELSE 0 END) as january,
    sum(CASE WHEN MONTH(applicationDate) = 2 THEN cast (PROPOSEDLIMIT as int) ELSE 0 END) as February,
    sum(CASE WHEN MONTH(applicationDate) = 3 THEN cast (PROPOSEDLIMIT as int) ELSE 0 END) as March,
    sum(CASE WHEN MONTH(applicationDate) = 4 THEN cast (PROPOSEDLIMIT as int) ELSE 0 END) as April,
    sum(CASE WHEN MONTH(applicationDate) = 5 THEN cast (PROPOSEDLIMIT as int) ELSE 0 END) as May,
    sum(CASE WHEN MONTH(applicationDate) = 6 THEN cast (PROPOSEDLIMIT as int) ELSE 0 END) as June,
    sum(CASE WHEN MONTH(applicationDate) = 7 THEN cast (PROPOSEDLIMIT as int) ELSE 0 END) as July,
    sum(CASE WHEN MONTH(applicationDate) = 8 THEN cast (PROPOSEDLIMIT as int) ELSE 0 END) as August,
    sum(CASE WHEN MONTH(applicationDate) = 9 THEN cast (PROPOSEDLIMIT as int) ELSE 0 END) as September,
    sum(CASE WHEN MONTH(applicationDate) = 10 THEN cast (PROPOSEDLIMIT as int) ELSE 0 END) as October,
    sum(CASE WHEN MONTH(applicationDate) = 11 THEN cast (PROPOSEDLIMIT as int) ELSE 0 END) as November,
    sum(CASE WHEN MONTH(applicationDate) = 12 THEN cast (PROPOSEDLIMIT as int) ELSE 0 END) as December
    from los_ext 
    group by RMNAME,MONTH(applicationDate)

您可以在Pivot Table上收集一些知识。

注意：以上查询将总结相同月份的数据，但月份可能属于不同年份。

For example 2015 February and 2014 February will be summed up to the same slot.

为了避免这种情况，您可以添加date range in where clause like you did。

因此，在查询的where子句中添加该日期范围如下所示：

select 
    rmname, 
    sum(CASE WHEN MONTH(applicationDate) = 1 THEN cast (PROPOSEDLIMIT as int) ELSE 0 END) as january,
    sum(CASE WHEN MONTH(applicationDate) = 2 THEN cast (PROPOSEDLIMIT as int) ELSE 0 END) as February,
    sum(CASE WHEN MONTH(applicationDate) = 3 THEN cast (PROPOSEDLIMIT as int) ELSE 0 END) as March,
    sum(CASE WHEN MONTH(applicationDate) = 4 THEN cast (PROPOSEDLIMIT as int) ELSE 0 END) as April,
    sum(CASE WHEN MONTH(applicationDate) = 5 THEN cast (PROPOSEDLIMIT as int) ELSE 0 END) as May,
    sum(CASE WHEN MONTH(applicationDate) = 6 THEN cast (PROPOSEDLIMIT as int) ELSE 0 END) as June,
    sum(CASE WHEN MONTH(applicationDate) = 7 THEN cast (PROPOSEDLIMIT as int) ELSE 0 END) as July,
    sum(CASE WHEN MONTH(applicationDate) = 8 THEN cast (PROPOSEDLIMIT as int) ELSE 0 END) as August,
    sum(CASE WHEN MONTH(applicationDate) = 9 THEN cast (PROPOSEDLIMIT as int) ELSE 0 END) as September,
    sum(CASE WHEN MONTH(applicationDate) = 10 THEN cast (PROPOSEDLIMIT as int) ELSE 0 END) as October,
    sum(CASE WHEN MONTH(applicationDate) = 11 THEN cast (PROPOSEDLIMIT as int) ELSE 0 END) as November,
    sum(CASE WHEN MONTH(applicationDate) = 12 THEN cast (PROPOSEDLIMIT as int) ELSE 0 END) as December
    from los_ext 
    WHERE applicationdate between '01-01-2016' and '31-12-2016'
    group by RMNAME,MONTH(applicationDate)

Answer 2

在派生表中执行cast和month内容（以节省一些输入，并符合ANSI SQL标准。）：

select rmname,
       sum(case when mnth = 1 then proplim else 0 end) as jan,
       sum(case when mnth = 2 then proplim else 0 end) as feb,
       ...
       sum(case when mnth = 12 then proplim else 0 end) as dec
from
(
  select rmname, cast (PROPOSEDLIMIT as int) proplim, MONTH(applicationDate) mnth
  from los_ext 
  where applicationdate between '01-01-2016' and '01-31-2016'
) dt
group by RMNAME

每个月的多个月的数据（rs的总和）不同

2 个答案: