RA For each of the relational algebra below, state whether they are correct or not for the following statement: List the topics of forums where the general user with user id “1” has posted at least once before the date “01-01-2022”. 1: A 2: B 3: C 4: D匹配题
A
No
B
Yes
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类似问题
Consider the following statements, select your best answer.
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RA2 Consider the following SQL: SELECT critic_score FROM rottentomatoes_movie NATURAL JOIN imdb_to_rottentomatoes NATURAL JOIN imdb_movie WHERE imdb_movie.year = '2022'; In the context of the previous schema for the netflix movie review database schema, which of the following Relational Algebra expressions represent the same resultset as the above SQL? (could be more than one) The schema is included again for convenience.
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