Difference between regular subquery and correlated subquery:

Regular subquery
Correlated subquery

The subquery is a query that is placed inside another SQL query and also embedded inside the “WHERE” clause.
In a SQL language, the values of correlated subquery used for the outer query. It is implemented once for each row in the outer query.

The first statement in the SQL is called as outer query and the second statement in the SQL is called as outer query.

The correlated subquery is depended by the outer query.

It is also called as inner query or nested query.
It is also called as repeating subquery or synchronized subquery...

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EBK DATABASE SYSTEMS: DESIGN, IMPLEMENT

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Regular subquery	Correlated subquery
The subquery is a query that is placed inside another SQL query and also embedded inside the “WHERE” clause.	In a SQL language, the values of correlated subquery used for the outer query. It is implemented once for each row in the outer query.
The first statement in the SQL is called as outer query and the second statement in the SQL is called as outer query.	The correlated subquery is depended by the outer query.
It is also called as inner query or nested query.	It is also called as repeating subquery or synchronized subquery...

Solution Summary: The author explains the difference between regular and correlated subquery.

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