1. Table(36번) 2.SELECT(34번) 3.FROM(12번) 4.WHERE(20번) 5. Entity(2번)
=> 2,3,4번 확정입니다. (아래는 DB 관련 원서 일부분입니다.)
The select clause corresponds to the projection operation of the relational algebra.
It is used to list the attributes desired in the result of a query.
The from clause corresponds to the Cartesian product operation of relational algebra.
It lists the relations to be scanned in the evaluation of the expression.
The where clause corresponds to the selection predicate of the relational algebra.
It consists of a predicate involving attributes of the relations that appear in the from clause.
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