Question

Perhaps it will be an simple question but, I don’t know how to achieve it simply.
I have two tables mentioned below.

TableA

ID  Student1 Student2 Student1_Class Student2_Class
1    S0001   S0002      A              A
2    S0001   S0003      B              A

TableB

  Class StudentID StudentName
    A     S0001     Jack
    A     S0002     Adam
    A     S0003     Lily
    B     S0001     Simpson

I’m expecting to get a result something like

   ID  Student1  Name1  Student2  Name2  Student1_Class Student2_Class
    1    S0001   Jack    S0002   Adam      A              A
    2    S0001   Simpson S0003   Lily      B              A

How can I create a view based on these two tables to get the desired result?

Answer 1

You have to JOIN on both Class and STudent becuase S0001 is repeated.

However, your output is wrong because there is no A/S0001 match for ID = 2 in TableA to get “Simpson”. So assuming this is a typo, here you g0

CREATE VIEW MyView
AS
 SELECT
   A.ID,
   A.Student1,
   B1.StudentName as Name1,
   A.Student2,
   B2.StudentName as Name2,
   A.Student1_Class,
   A.Student2_Class
 from
   TableA as A
   INNER JOIN
   TableB as B1 ON A.Student1_Class = B1.Class AND A.StudentID = B1.Student2
   INNER JOIN 
   TableB as B2 ON A.Student2_Class = B2.Class AND A.StudentID = B2.Student1