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Explanation :

A Subquery or Inner query or a Nested query is a query within another SQL query and embedded within the WHERE clause. Subqueries are most frequently used with the SELECT statement. The basic syntax is as follows:: SELECT column_name [, column_name ]FROM table1 [, table2 ]WHERE column_name OPERATOR(SELECT column_name [, column_name ]FROM table1 [, table2 ][WHERE]) A subquery is used to return data that will be used in the main query as a condition to further restrict the data to be retrieved. Subqueries can be used with the SELECT, INSERT, UPDATE, and DELETE statements along with the operators like =, , >=,