Question: If E 1 and E 2 are relational algebra expressions, then which of the following is NOT a relational algebra expression? a . projection b

If E1 and E2 are relational algebra expressions, then which of the following is NOT a relational
algebra expression?
a. projection
b. selection
c. union
d. join
e. intersection
If E1 and E2 are relational algebra expressions, then which of

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