MYSQL Mapping Letter Grade to its Equivalent Value

Question

I have two tables DEPORTMENT and DEPORTMENT_VAL.

TABLE DEPORTMENT
idnumber | subjectcode | 1st Qtr | 2nd Qtr | 3rd Qtr | 4th Qtr
1        | CL 7D       | A-      | A+      | A       | B+
1        | ENG 7D      | A+      | A+      | A+      | B+
1        | MATH 7D     | B+      | A-      | A+      | B+

TABLE DEPORTMENT_VAL
Grade | Value
A+    | 1
A     | 2
A-    | 3
B+    | 4

What should I query so that I can show this view?

TABLE DEPORTMENT
idnumber | subjectcode | 1st Qtr | 2nd Qtr | 3rd Qtr | 4th Qtr
1        | CL 7D       | 3       | 1       | 2       | 4
1        | ENG 7D      | 1       | 1       | 1       | 4
1        | MATH 7D     | 4       | 3       | 1       | 4

Update: I changed the DEPORTMENT table by quarters because I need to get the average of these grades per quarter after I get this view.

Answer 1

SELECT *
FROM DEPORTMENT
JOIN DEPORTMENT_VAL USING (Grade)