如何在SQL中联接多个select语句并在不同的列中显示

Question

我编写了一个查询，该查询将两个表连接起来，显示总数no. of appointments 使用union关键字no. of appointments和leads的查询，我希望此查询的结果显示在两个不同的列中，我对此有一个很难理解的描述

SELECT COUNT(FilteredAppointment.createdbyname) AS Appointment
FROM  FilteredBusinessUnit 
INNER JOIN FilteredSystemUser 
    ON FilteredBusinessUnit.businessunitid = FilteredSystemUser.businessunitid 
INNER JOIN FilteredAppointment 
    ON FilteredSystemUser.systemuserid = FilteredAppointment.createdby
UNION
SELECT COUNT(FilteredLead.fullname) AS Lead
FROM  FilteredBusinessUnit 
INNER JOIN FilteredSystemUser 
    ON FilteredBusinessUnit.businessunitid = FilteredSystemUser.businessunitid 
INNER JOIN FilteredLead 
    ON FilteredSystemUser.systemuserid = FilteredLead.createdby
WHERE (FilteredBusinessUnit.name IN (@Branch))

我想要的结果是：

CRITERIA | Appointment | Leads
Total    | 200         | 123

Answer 1

联盟不是正确的方法。 Union合并或合并为具有相同数量的列和数据类型的结果集。 我会做这样的事情。

SELECT 
    (   SELECT COUNT(FilteredAppointment.createdbyname)
        FROM  FilteredBusinessUnit INNER JOIN
              FilteredSystemUser ON FilteredBusinessUnit.businessunitid = FilteredSystemUser.businessunitid INNER JOIN
              FilteredAppointment ON FilteredSystemUser.systemuserid = FilteredAppointment.createdby
        WHERE (FilteredBusinessUnit.name IN (@Branch))
    ) AS Appointment ,
    (   SELECT COUNT(FilteredLead.fullname)
        FROM  FilteredBusinessUnit INNER JOIN
              FilteredSystemUser ON FilteredBusinessUnit.businessunitid = FilteredSystemUser.businessunitid INNER JOIN
              FilteredLead ON FilteredSystemUser.systemuserid = FilteredLead.createdby
        WHERE (FilteredBusinessUnit.name IN (@Branch))
    ) AS Lead

为了回应您的评论，以便能够将数字与其他分支进行比较，我会尝试类似的方法。

SELECT  FilteredBusinessUnit.name , 
        SUM(CASE WHEN FilteredAppointment.createdbyname IS NOT NULL THEN 1 ELSE 0 END) AS Appointments,
        SUM(CASE WHEN FilteredAppointment.fullname IS NOT NULL THEN 1 ELSE 0 END) AS Leads
FROM    FilteredBusinessUnit 
        INNER JOIN FilteredSystemUser ON FilteredBusinessUnit.businessunitid = FilteredSystemUser.businessunitid 
        LEFT OUTER JOIN FilteredAppointment ON FilteredSystemUser.systemuserid = FilteredAppointment.createdby
        LEFT OUTER JOIN FilteredLead ON FilteredSystemUser.systemuserid = FilteredLead.createdby
WHERE   (FilteredBusinessUnit.name IN (@Branch1, @Branch2)) 
GROUP BY FilteredBusinessUnit.name

如果要查看所有分支，可以忽略where子句。

Answer 2

通过cross join而不是union执行此操作：

select 'Total', Appointment, Leads
from (SELECT COUNT(FilteredAppointment.createdbyname) AS Appointment
      FROM  FilteredBusinessUnit INNER JOIN
            FilteredSystemUser ON FilteredBusinessUnit.businessunitid = FilteredSystemUser.businessunitid INNER JOIN
            FilteredAppointment ON FilteredSystemUser.systemuserid = FilteredAppointment.createdby
     ) c1 cross join
     (SELECT COUNT(FilteredLead.fullname) AS Leads
      FROM  FilteredBusinessUnit INNER JOIN
            FilteredSystemUser ON FilteredBusinessUnit.businessunitid = FilteredSystemUser.businessunitid INNER JOIN
            FilteredLead ON FilteredSystemUser.systemuserid = FilteredLead.createdby
      WHERE (FilteredBusinessUnit.name IN (@Branch))
     ) t