Is it possible to do a NULL comparison in Relational Algebra?
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05-11-2019 - |
문제
Please consider the following question given in a booklet:
I have read about databases from Database System Concepts - by Henry F. Korth, but never saw an instance where we could do a NULL comparison in relational algebra queries - unlike SQL queries.
(C) is given the correct option, but my question is:
Is the statement III given above, a valid Relational Algebra query?
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