Databases have been in use long beforehand the personal computer arrived on the scene. IBM developed the Structured Query Language standard (dubbed SQL, and pronounced “See-Quel”) over 30 years ago as a way to retrieve data from their new “relational” database. A decade later, Oracle released the first commercial relational database that used SQL, and SQL has become the de-facto query language for the vast majority of popular database products.
For the complete story, we recommend the book “Easy Oracle PL/SQL Programming”. Once you have mastered basic SQL you are ready for the advanced book “Oracle PL/SQL Tuning” by Dr. Timothy Hall.
Even though SQL is the standard language for interacting with any contemporary database, it does not mean that SQL is without limitations. If we want to retrieve a set of records from the database and modify them according to a set of rules, (updating some and returning to the calling program others), we can’t do this with a single SQL call to the database. Complex processing requires the ability to compare values (often called Boolean logic) and implement programmatic flow control. In other words, some type of programming language was required to procedure the returned rows and implement the program rules. To achieve this capability, Oracle introduced the Procedural Language extensions to the Structured Query Language or PL/SQL.
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Basic example of Oracle programming is as follows :
ORACLE PROGRAMMING EXAMPLE -------------
GREATEST() returns the greatest of the list of expressions.
Syntax: GREATEST(<expression1>,<expression2>. . . <expression>)
2 GREATEST('ALEX','WALTER','PHILLIP') names,
3 GREATEST(10,20,135) numbers
4 FROM dual;
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