Question

在SQL Server 2012中，我需要查询为 where 子句中的每个元素返回一个值。

select count(id) idCount, squad from dbo.Project
where id  between 60000 and 80000
and status = ('Complete') and squad in ('Mechanical', 'Civil', 'Electrical', 'Architectural')
and fiscalyear = 2018
group by squad
order by squad asc

查询返回

idCount Squad
1       Civil
3       Electrical
3       Mechanical

我希望输出是什么

idCount     Squad
    0       Architectural
    1       Civil
    3       Electrical
    3       Mechanical

Answer 1

您需要left join。在SQL Server中，您可以执行以下操作：

select count(p.id), v.squad
from (values ('Mechanical'), ('Civil'), ('Electrical'), ('Architectural')
     ) v(squad) left join
     dbo.Project p
     on v.squad = p.squad and
        p.id between 60000 and 80000 and
        p.fiscalyear = 2018
group by v.squad
order by v.squad asc ;

请注意，所有where条件都需要放在on子句中，以防止无意中过滤不匹配的值。

所有Where子句条目的SQL结果

1 个答案: