Data Definition Language (DDL) •The SQL data-definition language (DDL) allows the specification of information about relations, including •The schema for each relation •The type of values associated with each attribute •The Integrity constraints •The …

Domains specify allowable values for attributes. Two categories: Elementary (predefined by the standard); User-defined. The name is an acronym for Structured Query Language. It is actually far richer than a query language: supports both a DML and a DDL.

Example: Declare branch_name as the primary key for branch and ensure that the values of assets are non-negative. The drop table command deletes all information about the dropped relation from the database. All tuples in the relation are …

support that is provided by Transact-SQL in both Microsoft SQL Server 2008 R2 and Microsoft SQL Server 2012 for Part 11: Information and Definition Schemas (SQL/Schemata) of both the 2008 and 2011 versions of the SQL language ISO/IEC 9075 international standard specification.

We shall focus on three specific data types for use in our practical work, as their equivalents (though they may be diferently named) can be found in almost any database environment. These data types appear in Oracle as the following: 1. VARCHAR2: is used to store variable-length character strings.

This document provides specifications for a database including: - An overview of the system and database being developed. - References and points of contact used in developing the specifications. - Identification and description of the database including naming conventions, relationships to other databases, and schema information.

ANSI X3.135-1986 specifies two languages that make up a relational model database management system. They are: A schema definition language, for declaring the structures and integrity constraints of a database.

Permitted Data Types (Data Domains) SQL standard specifies permitted data types, which can be roughly grouped into several families • Integers (small or long) • Real numbers (standard or double length and with various precisions) • Character strings (fixed or variable length) • Bit strings (fixed or variable length)

Embedded SQL and dynamic SQL --define how SQL statements can be embedded within general-purpose programming languages. Authorization – includes commands for specifying access rights to relations and views.

»Main SQL command for data definition The language has features for : Data definition, Data Manipulation, Transaction control (Transact-SQL), Indexing, Security specification (Grant and Revoke), Active databases, Multi-media, Distributed databases, etc.