Question

SP：

INNER JOIN StudentSubjectMapping SS ON SM.StudentID=SS.StudentID  
WHERE SM.CourseID=@CourseID OR @CourseID=0
  AND SM.ClassID=@ClassID OR @ClassID=0
  AND SM.ClassSectionID=@ClassSectionID OR @ClassSectionID=0
  AND SD.StudentID <> SS.StudentID

Answer 1

尝试在以下内容中添加括号$('.mobile-nav-toggle').on('click', function() { var status = $(this).hasClass('is-open'); if (status) { $('.mobile-nav-toggle, .mobile-nav').removeClass('is-open'); } else { $('.mobile-nav-toggle, .mobile-nav').addClass('is-open'); } });：

()

Answer 2

使用LEFT JOIN代替

    LEFT JOIN StudentSubjectMapping SS ON SM.StudentID=SS.StudentID  
    WHERE SM.CourseID=@CourseID OR @CourseID=0
      AND SM.ClassID=@ClassID OR @ClassID=0
      AND SM.ClassSectionID=@ClassSectionID OR @ClassSectionID=0
      AND SS.StudentID IS NULL

Answer 3

您可以使用NOT IN选择StudentIDs中不存在的StudentSubjectMapping

INNER JOIN StudentSubjectMapping SS ON SM.StudentID=SS.StudentID  
WHERE (SM.CourseID=@CourseID OR @CourseID=0)
  AND (SM.ClassID=@ClassID OR @ClassID=0)
  AND (SM.ClassSectionID=@ClassSectionID OR @ClassSectionID=0)
  AND (SD.StudentID NOT IN (SELECT StudentID FROM StudentSubjectMapping))

Answer 4

感谢您的支持。回答：

WHERE
    (SM.CourseID=@CourseID OR @CourseID=0)
    AND
    (SM.ClassID=@ClassID OR @ClassID=0)
    AND
    (SM.ClassSectionID=@ClassSectionID OR @ClassSectionID=0)
    AND
    SM.StudentID NOT IN (SELECT StudentID FROM StudentSubjectMapping)

不等于操作员不工作

4 个答案: