列值的SQL动态SUM

Question

我有这个sql，但我想要做的是让另一列有其他匹配列的总和这样......

declare @SchoolID int
declare @RoleID int
declare @match int
declare @firstname varchar

set @SchoolID=1
set @RoleID=1

SELECT     
    dbo.Teacher.Firstname, 
    dbo.School.SchoolName, 
    dbo.School.SchoolID, 
    dbo.RoleTitle.RoleTitle,
    CASE WHEN dbo.School.SchoolID = @SchoolID then 1 else 0 end as [SchoolMatch],
    CASE WHEN dbo.JobTitle.RoleTitleID = @RoleID then 1 else 0 end as [RoleMatch]

FROM         
    dbo.School INNER JOIN
    dbo.Lesson ON dbo.School.SchoolID = dbo.Lesson.SchoolID INNER JOIN
    dbo.RoleTitle ON dbo.Lesson.RoleTitleID = dbo.RoleTitle.RoleTitleID INNER JOIN
    dbo.Teacher ON dbo.Lesson.TeacherID = dbo.Teacher.TeacherID

Answer 1

您可以重复您的案例陈述并添加它们。

SELECT
  .
  .
CASE WHEN dbo.School.SchoolID = @SchoolID then 1 else 0 end +
  CASE WHEN dbo.JobTitle.RoleTitleID = @RoleID then 1 else 0 end as [NewColumn]

Answer 2

您可以这样做：

SELECT     
    dbo.Teacher.Firstname, 
    dbo.School.SchoolName, 
    dbo.School.SchoolID, 
    dbo.RoleTitle.RoleTitle,
    CASE WHEN dbo.School.SchoolID = @SchoolID then 1 else 0 end as [SchoolMatch],
    CASE WHEN dbo.JobTitle.RoleTitleID = @RoleID then 1 else 0 end as [RoleMatch],
    (CASE WHEN dbo.School.SchoolID = @SchoolID then 1 else 0 end)+
    (CASE WHEN dbo.JobTitle.RoleTitleID = @RoleID then 1 else 0 end) AS NewColumn
FROM         
    dbo.School INNER JOIN
    dbo.Lesson ON dbo.School.SchoolID = dbo.Lesson.SchoolID INNER JOIN
    dbo.RoleTitle ON dbo.Lesson.RoleTitleID = dbo.RoleTitle.RoleTitleID INNER JOIN
    dbo.Teacher ON dbo.Lesson.TeacherID = dbo.Teacher.TeacherID