What is the relational algebra from the question below. I already have the SQL and need it in relational algebra.

Student (snum: integer, sname: string, major: string, level: string, age: integer)

Class (name: string, meets_at: time, room: string, fid: integer)

Enrolled (snum: integer, cname: string)

Faculty (fid: integer, fname: string, deptid: integer)

2. Find the age of the oldest student who is either a History major or enrolled in a course taught by I. Teach.

SQL:

SELECT MAX(S.age)

FROM Student S

WHERE (S.major = History)

OR S.snum IN (SELECT E.snum

FROM Class C, Enrolled E, Faculty F

WHERE E.cname = C.name AND C.fid =F.fid AND F.fname =I.Teach);