What are the types of subquery?

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These are two types of subquery – Correlated and Non-Correlated. 
The correlated subquery cannot be considered as an independent query, but it can refer the column in a table listed in the FROM the list of the main query.
The Non-Correlated subquery can be considered as an 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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