Question: Use the following three relations for this homework: Students (sid, sname, age) Courses (cid, cname, dept) Take (sid, cid, grade) 1. Write relational algebraic

Use the following three relations for this homework: Students (sid, sname, age)

Use the following three relations for this homework: Students (sid, sname, age) Courses (cid, cname, dept) Take (sid, cid, grade) 1. Write relational algebraic expressions for the following queries: Find names of all courses taken by the students whose name is 'Joe' Find names of students who took all courses offered by the "CS" department Find names of 20-year-old students who have taken a "CS" course 2. Write Domain Relational Calculus (DRC) expressions for the above queries. Use the following abbreviations for this question: Students(SI, SN, SA), Courses (CI, CN, CD), Take(SID, CID, CG).

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