when to use subquery in sql code example

Example 1: NESTED QUERY SQL

SELECT column_name [, column_name ]
FROM   table1 [, table2 ]
WHERE  column_name OPERATOR
   (SELECT column_name [, column_name ]
   FROM table1 [, table2 ]
   [WHERE])

Example 2: what is subquery in sql

SUBQUERY IS NESTED QUERY INSIDE A SELECT, 
INSERT OR UPDATE METHODS. OR INSIDE ANOTHER SUBQUERY

Example 3: subquery in sql

SUBQUERY IS NESTED QUERY INSIDE A 
SELECT, INSERT OR UPDATE METHODS.
OR INSIDE ANOTHER SUBQUERY

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Sql Example

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