加入由表计数和组的3个表格

Question

我想要做的是将一个表（存折）的一堆数据汇总为4列。第一个是简单的，后面三个是符合每个CLIEntid标准的预订数量。

第三个（OnDemandCancels）和第四个（DayCenterCancels）是第二个（TotalCancels）的子集，因此第三个和第四个列中的某些行应该为零。

因为这个原因，我想我需要包括每个列的clientid，当他们从原始表派生，以便我可以沿着clientid加入他们。

这是接近我已经能够得到：

select 
    pb.clientid, 
    (select pb.clientid, count(pb.ldate) as TotalCancels 
     from passbooking as pb 
     where pb.ldate >= 20170201 
      and pb.ldate <= 20170228 
      and (pb.schedulestatus = 430 or pb.schedulestatus = 420) 
      group by pb.clientid) as tcxl, 
    (select pb.clientid, count(pb.ldate) as OnDemandCancels 
     from passbooking as pb 
     where pb.ldate >= 20170201 
      and pb.ldate <= 20170228 
      and (pb.schedulestatus = 430 or pb.schedulestatus = 420) 
      and pb.bookingpurpose <> 'P-DayCt') 
      group by pb.clientid) as odcxl, 
    (select pb.clientid, count(pb.ldate) as DayCenterCancels 
     from passbooking as pb 
     where pb.ldate >= 20170201 
      and pb.ldate <= 20170228 
      and (pb.schedulestatus = 430 or pb.schedulestatus = 420) 
      and pb.bookingpurpose = 'P-DayCt') 
      group by pb.clientid) as dccxl 
from passbooking as pb 
where pb.clientid = tcxl.clientid 
    and pb.clientid = odcxl.clientid 
    and pb.clientid = dccxl.clientid 

这给了我一个错误“多部分组成的标识符tcxl.clientid无法绑定”。

我知道每个子查询的功能都是我希望他们自己去做的，我的问题就在于弄清楚如何正确地加入它们。

谢谢！

Answer 1

select 
    pb.clientid 
from passbooking as pb 
inner join ( 
      (select pb.clientid, count(pb.ldate) as TotalCancels 
       from passbooking as pb 
       where pb.ldate >= 20170201 
       and pb.ldate <= 20170228 
       and (pb.schedulestatus = 430 or pb.schedulestatus = 420) 
       group by pb.clientid) 
       ) as tcxl 
on pb.clientid = tcxl.clientid 
inner join (
      (select pb.clientid, count(pb.ldate) as OnDemandCancels 
       from passbooking as pb 
       where pb.ldate >= 20170201 
       and pb.ldate <= 20170228 
       and (pb.schedulestatus = 430 or pb.schedulestatus = 420) 
       and pb.bookingpurpose <> 'P-DayCt') 
       group by pb.clientid) 
      )as odcxl 
on pb.clientid = odcxl.clientid 

inner join 
(
    (select pb.clientid, count(pb.ldate) as DayCenterCancels 
    from passbooking as pb 
    where pb.ldate >= 20170201 
    and pb.ldate <= 20170228 
    and (pb.schedulestatus = 430 or pb.schedulestatus = 420) 
    and pb.bookingpurpose = 'P-DayCt') 
    group by pb.clientid) 
)as dccxl 
on pb.clientid = dccxl.clientid 

Answer 2

跳过JOIN，使用case表达式来完成，而不是有条件的计数：

select 
    pb.clientid, 
    count(pb.ldate) as TotalCancels, 
    count(case when pb.bookingpurpose <> 'P-DayCt' then pb.ldate end) as OnDemandCancels, 
    count(case when pb.bookingpurpose = 'P-DayCt' then pb.ldate end) as DayCenterCancels 
from passbooking as pb 
where pb.ldate >= 20170201 
    and pb.ldate <= 20170228 
    and (pb.schedulestatus = 430 or pb.schedulestatus = 420) 
group by pb.clientid 

编辑 - 的要求：

“如果我需要什么，现在就加入此表另一个表（我需要从不同的表中获取客户端名称）在哪里添加该连接语句？“

只需JOIN与其他表（以下称为ClientsTable）上面的查询：

select b.clientid, b.TotalCancels, b.OnDemandCancels, b.DayCenterCancels, c.clientname 
from 
(
    select 
     pb.clientid, 
     count(pb.ldate) as TotalCancels, 
     count(case when pb.bookingpurpose <> 'P-DayCt' then pb.ldate end) as OnDemandCancels, 
     count(case when pb.bookingpurpose = 'P-DayCt' then pb.ldate end) as DayCenterCancels 
    from passbooking as pb 
    where pb.ldate >= 20170201 
     and pb.ldate <= 20170228 
     and (pb.schedulestatus = 430 or pb.schedulestatus = 420) 
    group by pb.clientid 
) b 
JOIN ClientsTable c on b.clientid = c.clientid