How To Use The SQL NOT EXISTS and EXISTS Operator ?

 SQL NOT EXISTS and EXISTS operators have been available since the very first edition of the SQL Standard. Still many fail to understand that SQL subquery expressions are powerful when it comes to filtering a given table based on a condition evaluated on a different table. The logical operator called ‘SQL EXISTS’ is used to determine if any given record in a database already exists. If the subquery produces one or more records, it returns TRUE. In contrast to the EXISTS operator, SQL NOT EXISTS is satisfied if no rows are returned by the subquery. If you want to clear your concepts on different SQL Operators and understand the functioning of SQL queries, join in an online sql training program. Master SQL and improve your career prospects with SQL Certifications. Click Here...

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