Module $-3$

$15$ a$)$ For the relation schema below, give an expression in SQL for each of the queries that follows:

employee $($ID$,$ person$\_$name, street, city$)$

works $($ID$,$ company$\_$name, salary$)$

company $($ company name, city$)$

manages $($ID$,$ manager$\_$id$)$

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