Question: Express the following SQL queries in relational algebra: 3) What are the singers who performed at least one concert in all halls? SELECT singer FROM

Express the following SQL queries in relational algebra:

3) What are the singers who performed at least one concert in all halls?

SELECT singer FROM Show S1 WHERE NOT EXISTS (SELECT * FROM Hall H WHERE NOT EXISTS (SELECT * FROM Show S2 WHERE S2.singer = S1.singer AND H.hall_id = S2.hall_id))

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