Express the following SQL queries in relational algebra: 2) What are the singers who have never...
Express the following SQL queries in relational algebra:
2) What are the singers who have never scheduled the concert at Saint-Denis 2?
SELECT singer FROM Show WHERE singer NOT IN (SELECT singer
FROM Show S, Hall H WHERE S.hall_id = H.hall_id AND H.name = 'Saint-Denis 2')
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Express the following SQL queries in relational
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