HELP! * BLUE=global GREY=local Global HTML version of Foils prepared July 23,1995
Foil 44 What is PL/SQL -- I ?
From Full Relational Database HPDC-4 Presentation HPDC-4 Tutorial/CPS616 Spring95 -- August 1, Pentagon City Virginia. byGang Cheng Marek Podgorny (Geoffrey Fox) * See also color IMAGE
PL/SQL illustrates some low-level data access tools/languages that are available in most RDBMS.
Basically, there are three levels of database access interfaces:
1. highest level --- SQL
Non-procedure language, only specify what-to-do, not how-to-do.
So-called fouth-generation language (4GL). no control structures(loop,if)
No module (block) structure, very expressive or declarative.
One Other Language example in this category is Prolog.
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