SQL GroupBY columnABC和提取不同的columnABC值

我有下面的查询，它给出了我想要的结果，但我想重复这个查询，以便对投票表中的所有WardNos执行

SELECT WardNo, (SELECT COUNT(Gender) 
                FROM dbo.Voter
                WHERE (Gender = 'Male') AND (WardNo = '105')) AS MaleVoter,
               (SELECT COUNT(Gender) AS Expr1
                FROM dbo.Voter AS Voter_2
                WHERE (Gender = 'Female') AND (WardNo = '105')) AS Female-voter
FROM dbo.Voter AS Voter_1
WHERE (WardNo = '105')
GROUP BY WardNo

输出应该是这样的

WardNo Cast Male Female
103    abc  55   25
104    abc  192  45

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您可以将“105”替换为Voter_1.WardNo，这将在内部查询中提供对外部表Voter_1的引用

移除

WHERE     (WardNo = '105')

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这将为您提供所有WardNo的结果，我假设您的表Ward和Gender中只有两列。下面是一个查询，它可以让你得到按性别、按选区分组的选民数量

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什么数据库？SQL Server，Oracle？请发布您的表的结构。我正在使用SQL Server和VarChar dataTypesUm，强制转换从何而来？它不在你的选择列表中…@Hamad，我的答案不对吗？

declare @Voter as table
(
Ward int,
Gender varchar(max)
)

Insert into @Voter values(106, 'Male')
Insert into @Voter values(106, 'Male')
Insert into @Voter values(107, 'Male')
Insert into @Voter values(107, 'Female')

Select * from @Voter

Select Ward, 
sum(case when Gender = 'Male' then 1 else 0 end) AS male,
sum(case when Gender = 'Female' then 1 else 0 end) as female 
from @Voter
group by ward