查看与主键关联的表数据

Question

表格：

1-Student_Info（主键是ID_Student）

2-Student_Absent（外键= ID_Student）

3-Student_Deg（外键= ID_Student）

Linq代码：

Dim x = (From i in Student_Info).ToList
msgbox (x.Student_Absent.toList.Count)

我正在使用此代码，但我想以另一种方式来了解与此表关联的数据

        X = (From I in Student_Info Group Join Student_Absent in Student_Absent On I.ID_Student Equals Student_Absent.ID_Student Into Student_Absent_Into = Group From Student_Absent_Group In Student_Absent_Into.DefaultIfEmpty()

    IF X.Student_Absent_Group IS Nothing Then
           Db.Student_Info.REMOVE(X.Student_Absent_Group)
    END IF