What are the types of subquery?

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Answer:

There are two types of subquery – Correlated and Non-Correlated.

A correlated subquery cannot be considered as independent query, but it can refer the column in a table listed in the FROM the list of the main query.

A Non-Correlated sub query can be considered as independent query and the output of subquery are substituted in the main query.

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What are the types of subquery?

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833. What is a stored procedure?

841. When Right Join gives result like Left Join?

842. When Left Join gives result like Right Join?

843. When to use single-column index or a composite index?

844. When should indexes be avoided?

845. When should indexes be created?

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