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The lowest level operator to access data in query processing is _______

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The lowest level operator to access data in query processing is _______

(a) File scan

(b) File manipulation

(c) File handling

(d) File organization

The question was asked in homework.

My question is taken from Query Processing in portion Query Processing and Optimization of RDBMS

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The correct choice is (a) File scan

The explanation: The lowest level operator to access data in query processing is file scan. File scans are algorithms that locate and retrieve records that fulfill a selection criterion.

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