SQL 多次计数

Question

你能解释一下我是如何得到这个特定的表格结果的吗？

我的 4 个查询分别单独获取每一列也在下面。

我不确定这里的方法是将最后 3 个查询嵌套到第一个查询中还是在查询之间使用联合。

请记住，每个信息中的信息并不真正匹配，我认为 Union 或 Union All 不会有用。

派生表会是更好的方法吗？抱歉，我的 SQL 技能相当基础。

我还需要保留“调整” where 子句的能力，因为我的管理员决定稍后排除某些记录（你们 IT 人员会习惯的！）

一些改变 where 子句的能力在解决方案中会很好。

只是为了让你更讨厌;-)

查询表需要看起来像这样

Company Department  Total_B Total_R Total_Ret   RushJobs
ACME    LSD     2   100     24      3           

四个查询（分别工作以获取上面的每一列都在这里（我已经留在了相应的 Group By 和 where 子句中，顺便说一下，在第二个查询的情况下，I_Department 确实映射到 Department。

-- Total B count query from B
Select  Company,Department, count(*) as Total_B  from B
Group by Company,Department
Order BY Company;

--Select h count from h table
    Select count(*) as Total_R, I_Department from H
    where  L ='re-box' 
    Group By IDepartment

-- Select r count 
    Select Company,Department,Count (B_Number) AS Total_Ret
    from P Inner Join B ON P.Record_Number = B.B_Number
    where P.Request_Date > = 'SOMEDATE' and P.Request_Date < = 'SOMEDATERANGE'
    Group By Company,Department

-- Select Rush Jobs
    Select Company,Department,Count (*) as RushJobs 
    from Res
    Inner Join B on Res.Item_Number = B.B_Number 
    where Res.Setup_Date >= 'Somedate' and Res.Setup_Date<= 'somedaterange' 
    and Res.Res_Priority = '1'
     Group By Company,Department

决赛桌

<table><TBODY>
<TR>
<TH>Company</TH>
<TH>Department</TH>
<TH>Total_B</TH>
<TH>Total_R </TH>
<TH>Total_Ret</TH>
<TH>RushJobs</TH></TR>
<TR>
<TD>ACME</TD>
<TD>LSD</TD>
<TD>100</TD>
<TD>2</TD>
<TD>4</TD>
<TD>1</TD></TR></TBODY></table>

Answer 1

一种方法是使用公用表表达式 (CTE) 又名 with 语句..

这允许每个查询继续保持独立，让您可以轻松地调整每个查询的 where 子句（我打算更正那个错字，但它太有趣了），并最终将结果组合在一起，返回 1 条记录和 4 列.

-- Total B count query from B
With B as (
Select  Company,Department, count(*) as Total_B  from B
Group by Company,Department
Order BY Company),

H as (
--Select h count from h table
Select count(*) as Total_R, I_Department from H
where  L ='re-box' 
Group By IDepartment),

R as (-- Select r count 
Select Company,Department,Count (B_Number) AS Total_Ret
from P Inner Join B ON P.Record_Number = B.B_Number
where P.Request_Date > = 'SOMEDATE' and P.Request_Date < = 'SOMEDATERANGE'
Group By Company,Department),

RushJobs as (-- Select Rush Jobs
Select Company,Department,Count (*) as RushJobs 
from Res
Inner Join B on Res.Item_Number = B.B_Number 
where Res.Setup_Date >= 'Somedate' and Res.Setup_Date<= 'somedaterange' 
and Res.Res_Priority = '1'
Group By Company,Department)

SELECT coalesce(B.Company, R.Company, RJ.Company)
     , coalesce(B.Department,R.Department, Rj.Department)
     , B.Total_B, H.Total_R, R.Total_Ret, RJ.RushJobs
FROM
FULL OUTER JOIN  H
   on B.Company = H.Company
FULL OUTER JOIN  R
   on B.company = R.Company
  and B.Department = R.Department
FULL OUTER JOIN  RushJobs RJ
   on H.company = RJ.Company
  and H.Department = RJ.Department