Database Languages Tutorial

DB LANGUAGES ::

Data Definition language: DDL used to define the db schema (data types, str,

constraints) e,g  SQL..

Data Manipulation language: DML s used to both read & update db(insert, updat,

del, retrieve) by data manipulation language (DML) r of two types

    a .  procedural lang : manipulate db record by record, allow users to state how t

oretrieve the data e,g c , C++ , java

    b.   non procedural lang : manipulates sets of records of db allow users to statewat

 data s needed e,g  SQL,QBE (query by examp)..

4GL : fourth generation language ::e,g SQL, QBE..

ENTITY :: s a distinct object (a person, place, thing , concept, event)

SEQUAL SERVER :: s a Ms sw whose name s SQL - SERVER ....

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