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Why do many DBMS push their own programming languages?

Why do many DBMS (ex. Oracle) push their own programming languages (ex. PL/SQL)? And what can PL/SQL be used for in Oracle?
So that database vendors can provide features that differentiate their product from other vendors – to provide sought out flexibility to IT professionals for their particular DBMS.

PL/SQL is the procedural language extension for ORACLE that allows programmers for writing their own procedures and functions as well as using the vast array of built-ins or APIs to process, manipulate, transform and present data retrieved from the ORACLE database that can not be achieved by strict or pure SQL.

You can use PL/SQL for displaying a simple output of "Hello world" to building complex applications.

This was last published in February 2005

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