InterBase 6 Data Definition Guide

Название: InterBase 6 Data Definition Guide
Издательство: Borland/INPRISE
Год: 1999
Язык: Английский
Формат: PDF
Качество: Отличное
Размер: 1.3 MB


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Аннотация:
An InterBase database is created and populated using SQL statements, which can be
divided into two major categories: data definition language (DDL) statements and data
manipulation language (DML) statements.
The underlying structures of the database—its tables, views, and indexes—are created
using DDL statements. Collectively, the objects defined with DDL statements are known
as metadata. Data definition is the process of creating, modifying, and deleting
metadata. Conversely, DML statements are used to populate the database with data, and
to manipulate existing data stored in the structures previously defined with DDL
statements. The focus of this book is how to use DDL statements. For more information
on using DML statements, see the Language Reference.