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Views in relational algebra:
1. Basic expression contains either
a) A relation in the database.
b) A constant relation.
2. General expressions are madde out of smaller sub expressions using
a) σp(E1) select (p a predicate)
b) ∏s(E1) project (s a list of attributes)
c) Px(E1)rename (x a relation name)
d) E1∪E2 union
e) E1- E2 set difference
f) E1x x E2 cartesian product
Which is a legal expression in SQL? SELECT NAME FROM EMPLOYEE is a legal expression in SQL.
The natural join is equal to which product? The natural join is equal to Combination of projection and Cartesian product
why data in an RDMS need to be normalised
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