Basic HTML version of Foils prepared 7 October 97

Foil 39 What is PL/SQL -- I ?

From untitled presentation ARL Database Tutorial -- February 98. by Gang Cheng Marek Podgorny Chao-Wei Ou
1 PL/SQL illustrates some low-level data access tools/languages that are available in most RDBMS.
2 Basically, there are three levels of database access interfaces:
3 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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© on Mon Oct 13 1997