Question

我想创建一个简单的查询来计算列中相似值的数量。示例如下：

declare @temo table (sno int identity, dyscode varchar(200), isVerified bit, isCorrect bit, isRejected bit, isDeleted bit)

insert into @temo values('dys',1,1,0,0)
insert into @temo values('dys',1,1,0,0)
insert into @temo values('dys',1,0,1,0)
insert into @temo values('dys',1,0,0,1)
insert into @temo values('dys',1,0,1,0)
insert into @temo values('dys',1,0,0,1)
insert into @temo values('dys',0,0,0,0)
insert into @temo values('dys',1,0,0,1)

预期输出应

'DYS'，7,2,3

请分享一些快速有效的解决方案。此操作需要在数百万条记录上运行，因此性能将是一个非常重要的问题。

Answer 1

你需要转换位列来对它们执行求和功能，因为求和函数不支持位数据类型。

参考链接：https://msdn.microsoft.com/en-IN/library/ms187810.aspx

以下查询将获得所需的结果： -

SELECT   dyscode,
     sum(cast(isVerified as int)),
     sum(cast(isCorrect as int)),
     sum(cast(isRejected as int)),
     sum(cast(isDeleted as int))
FROM     @temo
GROUP BY dyscode

Answer 2

好像你只是在总结0/1列：

SELECT   dyscode,
         SUM(isVerified),
         SUM(isCorrect),
         SUM(isRejected),
         SUM(isDeleted)
FROM     @temo
GROUP BY dyscode

Answer 3

    Select dyscode, 
sum(isVerified), 
sum(isCorrect), 
sum(isRejected), 
sum(isDeleted)
        From 
        @temo
    Group by dyscode

使用sum函数，因为值是二进制的。

Answer 4

您必须对dyscode列和其他列的总和进行分组。

您可以使用以下查询。

Select dyscode ,SUM(isVerified),SUM(isCorrect),SUM(isRejected),SUM(isDeleted) from #temo group by dyscode

计入表SQL Server

4 个答案: