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The process of replacing a nested query with a query with a join is known as _________

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The process of replacing a nested query with a query with a join is known as _________

(a) Correlation

(b) Decorrelation

(c) Cache handling

(d) Join replacement

I had been asked this question in exam.

This is a very interesting question from Choice of Evaluation Plans topic in section Query Processing and Optimization of RDBMS

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Right answer is (b) Decorrelation

Easiest explanation: The process of replacing a nested query with a query with a join is known as decorrelation. It is more complicated when the nested sub query uses aggregate functions inside it.

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