The relational algebra operator that produces a subset of the columns of the input table is the _________________ operator.
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Q60: In the set-oriented database terminology,a(n)_ is synonymous
Q61: A(n)_ is an operator that includes in
Q62: A(n)_ is an operator that includes in
Q63: A(n)_ set operator retrieves all rows in
Q64: In relational algebra,the _ operator shows everything
Q66: A(n)_ set operator retrieves just the common
Q67: The _ operator produces a table in
Q68: The relational algebra operator that retrieves a
Q69: A row in a child table having
Q70: To prohibit actions on referenced rows to
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