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Team-Fly

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	Sams Teach Yourself SQL in 24 Hours, Third Edition By Ronald R. Plew, Ryan K. Stephens
	Table of Contents
	Hour  19.  Managing Database Security

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You were shown the basics on implementing security in a SQL database or a relational database. You learned the basics of managing database users. The first step in implementing security at the database level for users is to create the user; after the user has been created, the user must be assigned certain privileges that allow the user access to specific parts of the database, and now ANSI allows the use of roles as discussed during this hour. Privileges can be granted to users or roles. There are two types of privileges: system and object privileges.

System privileges are those that allow the user to perform various different tasks within the database, such as actually connecting to the database, creating tables, creating users, altering the state of the database, and so on. Object privileges are those that allow a user access to specific objects within the database, such as the ability to select data or manipulate data in a specific table.

There are two commands in SQL that allow a user to grant and revoke privileges to and from other users or roles in the database: GRANT and REVOKE. These two commands are used to control the overall administration of privileges in the database. Although there are many other considerations for implementing security in a relational database, the basics that relate to the language of SQL were discussed during this hour.

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