加入由表計數和組的3個表格

Question

我想要做的是將一個表（存摺）的一堆數據彙總爲4列。第一個是簡單的，後面三個是符合每個CLIEntid標準的預訂數量。

第三個（OnDemandCancels）和第四個（DayCenterCancels）是第二個（TotalCancels）的子集，因此第三個和第四個列中的某些行應該爲零。

因爲這個原因，我想我需要包括每個列的clientid，當他們從原始表派生，以便我可以沿着clientid加入他們。

這是接近我已經能夠得到：

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 

這給了我一個錯誤「多部分組成的標識符tcxl.clientid無法綁定」。

我知道每個子查詢的功能都是我希望他們自己去做的，我的問題就在於弄清楚如何正確地加入它們。

謝謝！

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

跳過JOIN，使用case表達式來完成，而不是有條件的計數：

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 

編輯 - 的要求：

「如果我需要什麼，現在就加入此表另一個表（我需要從不同的表中獲取客戶端名稱）在哪裏添加該連接語句？「

只需JOIN與其他表（以下稱爲ClientsTable）上面的查詢：

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