What technique is used for the evaluation of a query with a nested sub query?(a) Caching(b) Decorrelated evaluation(c) Correlated evaluation(d) Time based evaluationThe question was posed to me in an interview for internship.I would like to ask this question from Choice of Evaluation Plans in portion Query Processing and Optimization of RDBMS

What technique is used for the evaluation of a query with a nested sub

1.	What technique is used for the evaluation of a query with a nested sub query?(a) Caching(b) Decorrelated evaluation(c) Correlated evaluation(d) Time based evaluationThe question was posed to me in an interview for internship.I would like to ask this question from Choice of Evaluation Plans in portion Query Processing and Optimization of RDBMS
Answer» The correct CHOICE is (c) Correlated evaluation For explanation I would SAY: The technique used to EVALUATE a query with a nested SUB query is called as correlated evaluation. It is not very efficient as a large number of I/O operations may occur.

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