I've written some query does this all are good for returning same result or some query will give different rows?

Question

Query 1
Select student from enrolled where student in(select student from paid)
Query 2
Select student from paid where student in (select student from enrolled)
Query 3
Select E.student from enrolled E, paid P where E.student = P.student
Query 4
Select student from paid where exists (select * from enrolled where enrolled.student = paid.student)
Which will gives same result and why

Answer 1

yamila blanco
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