How To Use The SQL NOT EXISTS and EXISTS Operator ?

 Finding it difficult to understand the use of SQL NOT EXISTS and EXISTS operators? You have landed at the right place.  SQL NOT EXISTS and EXISTS operators have been available since SQL:86, 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 subquery word has been used multiple times till time. Do you actually know the meaning of subquery in SQL? If not, don’t worry. We will discuss in brief what is a SQL subquery before going deeper.




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