Question

我有一个包含四行的表@EmplTable。它是四名员工的名字。

然后我有一张表@MonitorTable，用于监控这些员工的工作。

假设没有任何内容发生在桌面上，@MonitorTable将有12行，对应于这四名员工将要工作的三周。对于所有内容，列IsProcessed都为空，这意味着没有分配任何内容。

我们假设IsProcessed的{{1}} 3 EmpId设为WeekNum，我如何确定WeekNum有多少组{4}空值？在这种情况下，结果将是2（WeekNum 2＆amp; 3），因为WeekNum 1有一行IsProcessed设置为true。

我包括脚本。任何帮助表示赞赏。

感谢。

declare @EmplTable table
(
    EmpId INT IDENTITY NOT NULL PRIMARY KEY,   
    Name varchar(20)
)

insert into @EmplTable (Name) select 'John'
insert into @EmplTable (Name) select 'Mary'
insert into @EmplTable (Name) select 'Ron'
insert into @EmplTable (Name) select 'Bob'

declare @count int
select @count = count(*) from @EmplTable

declare @MonitorTable table
(
    EmpId int,
    WeekNum int,
    IsProcessed bit
)

insert into @MonitorTable (EmpId, WeekNum) select 1, 1
insert into @MonitorTable (EmpId, WeekNum) select 2, 1
insert into @MonitorTable (EmpId, WeekNum) select 3, 1
insert into @MonitorTable (EmpId, WeekNum) select 4, 1
insert into @MonitorTable (EmpId, WeekNum) select 1, 2
insert into @MonitorTable (EmpId, WeekNum) select 2, 2
insert into @MonitorTable (EmpId, WeekNum) select 3, 2
insert into @MonitorTable (EmpId, WeekNum) select 4, 2
insert into @MonitorTable (EmpId, WeekNum) select 1, 3
insert into @MonitorTable (EmpId, WeekNum) select 2, 3
insert into @MonitorTable (EmpId, WeekNum) select 3, 3
insert into @MonitorTable (EmpId, WeekNum) select 4, 3

update @MonitorTable set IsProcessed = 1 where EmpId = 1 and WeekNum = 1

SELECT  WeekNum
FROM    @MonitorTable
GROUP BY WeekNum
HAVING  COUNT(CASE WHEN IsProcessed = 1 THEN 0
                   ELSE 1
              END) = @count

-- Should return 2, 3 since WeekNum has been updated. It returns 1, 2, 3.

Answer 1

这应该为您提供所需的2条记录

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Answer 2

declare @EmplTable table
(
    EmpId INT IDENTITY NOT NULL PRIMARY KEY,   
    Name varchar(20)
)

insert into @EmplTable (Name) select 'John'
insert into @EmplTable (Name) select 'Mary'
insert into @EmplTable (Name) select 'Ron'
insert into @EmplTable (Name) select 'Bob'

declare @MonitorTable table
(
    EmpId int,
    WeekNum int,
    IsProcessed bit
)

insert into @MonitorTable (EmpId, WeekNum) select 1, 1
insert into @MonitorTable (EmpId, WeekNum) select 2, 1
insert into @MonitorTable (EmpId, WeekNum, IsProcessed) select 3, 1, 1
insert into @MonitorTable (EmpId, WeekNum) select 4, 1
insert into @MonitorTable (EmpId, WeekNum) select 1, 2
insert into @MonitorTable (EmpId, WeekNum) select 2, 2
insert into @MonitorTable (EmpId, WeekNum) select 3, 2
insert into @MonitorTable (EmpId, WeekNum) select 4, 2
insert into @MonitorTable (EmpId, WeekNum) select 1, 3
insert into @MonitorTable (EmpId, WeekNum) select 2, 3
insert into @MonitorTable (EmpId, WeekNum) select 3, 3
insert into @MonitorTable (EmpId, WeekNum) select 4, 3

select * from @MonitorTable

if object_id('tempdb..#temp') is not null drop table #temp

select WeekNum as ct
into #temp
from  @MonitorTable
group by WeekNum
having sum(cast(isnull(IsProcessed,0) as int)) = 0


select count(ct) as ct from #temp

获取有多少组将列的所有值设置为null？

2 个答案: