Table instructors / subjects

EnglishMathPhysicsSums
1M. X 0
2Bill 1 1
3Joe 1 1
4Susan2 2
2114

Table instructors / rooms

A1Sums
1M. X 0
2Bill1 1
3Joe1 1
4Susan2 2
44

Table subjects / rooms

A1Sums
1S??? 0
2English2 2
3Math1 1
4Physics1 1
44