Question

我正在编写一些select语句。

因此：

Select JobType, count(JobType) as count from PrintJobs with (nolock)
where JobType in (1, 2, 3, 4)
and convert(datetime, TimeSubmitted) > cast(CAST(dateadd(dd, -1,GETDATE()) as date)  as datetime) + CAST('17:30:00.000' as time)
group by JobType

问题在于，当JobTypes没有显示任何内容时，表格如下所示

JobTypes | count  |
------------------|
    2        1    |
    3        2    |
__________________|

有没有办法让它像这样：

JobTypes | count  |
------------------|
    1        0    |
    2        1    |
    3        2    |
    4        0    | 
__________________|

所以，即使作业类型的结果中没有任何内容，它仍会显示出来？我试图使其尽可能动态，其中可以在c＃sql参数中设置jobtypes

提前致谢

Answer 1

一个解决方案是left join：

Select j.JobType, count(pj.JobType) as count
from (values (1), (2), (3), (4)) j(jobtype) left join
     PrintJobs pj
     on pj.JobType = j.jobType and
        convert(datetime, TimeSubmitted) > cast(CAST(dateadd(day, -1,GETDATE()) as date)  as datetime) + CAST('17:30:00.000' as time)
group by j.JobType

Answer 2

在这样的SQL Server中：

.scaleImage{
  width:100%;
}

在这里，您可以创建类型和连接的表。

Answer 3

  Select JTypes.JType, count(P.JobType) as count 
 from (
 SELECT 1 as JType
 UNION ALL
 SELECT 2 as JType
 UNION ALL
 SELECT 3 as JType
 UNION ALL
 SELECT 4 as JType
  ) AS JTypes
  LEFT JOIN PrintJobs AS P ON P.JobType = JTypes.JType 
   WHERE  convert(datetime, P.TimeSubmitted) > cast(CAST(dateadd(dd, -1,GETDATE()) as date)  as datetime) + CAST('17:30:00.000' as time)
group by JTypes.JType

遇到SQL Select查询问题

3 个答案: