DBMS Query Language Relational Algebra

π_A,F (σ_{C = D} (R × S))
find equivalent SQL query.

1

select * from R,S where C = D

2

Select A, F from R, S where C = D

3

Select distinct C, D from R, S where A = F

4

Select distinct A, F from R, S where C = D

5

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