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EXECUTE sp_addrolemember role_name, user_name
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Alternatively, you can add a database user to a role via SSMS by modifying the database user s properties or the role s properties. You can nest database roles, so you can add database roles into other roles. For example, suppose that you want to group managers in the Accounting department into a database role called AccountingMgr. You could grant that role the permissions of the entire Accounting role by nesting Accounting within AccountingMgr and then just granting the extra manager permissions to the AccountingMgr role. To obtain information about database role members, you can query the sys.database_role_members catalog view, which returns one row for each member of the database role.
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True or False: Database roles are all fixed, giving you a predefined set of permissions that you can grant to a group of like database users. False. Although SQL Server provides a set of fixed database roles, you can also create your own roles.
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Managing Schemas
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SQL Server 2005 implements the ANSI concept of schemas, which are collections of database objects such as tables, views, stored procedures, and triggers that form a single namespace. The main benefit of schemas in SQL Server 2005 is that schemas and users are now separate entities. User name is no longer part of object name, as it was in previous versions of SQL Server, so you can remove users or change user names without having to make application changes. Each schema is owned by a user or role, but if you need to drop a user or role, you just transfer the schema ownership from the user or role you re dropping to another new user or role.
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Lesson 5: Configuring Database Securables
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The basic syntax to create a schema is
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CREATE SCHEMA schema_name AUTHORIZATION owner
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To modify a schema, you can use the ALTER SCHEMA statement; to remove a schema, you can use the DROP SCHEMA statement. You can also accomplish these tasks from SSMS. To retrieve information about schemas, you can query the sys.schemas catalog view. In addition, you can assign a default schema for each database user. This default schema is used when the user does not specify the schema name when accessing an object. For instance, if user Peter has a default schema of HumanResources and wants to access the Employee table without specifying a schema, he can just specify Employee instead of having to specify HumanResources.Employee. You assign a default schema by using the CREATE USER or ALTER USER statement. You also can assign a default schema through SSMS in the user s properties.
PRACTICE
Configuring Server Securables
In this practice, you will configure server securables for the AdventureWorks database. You will create a login and database user for Peter. Peter needs access to the HumanResources schema objects in AdventureWorks. 1. Use the following CREATE LOGIN statement to create a SQL Server login and database user named Peter that has access to the AdventureWorks database:
CREATE LOGIN Peter WITH PASSWORD='Pa$$w0rd' GO USE AdventureWorks GO CREATE USER Peter FROM LOGIN Peter
2. Grant Peter SELECT permission to HumanResources database objects by coding the following statement (note the :: syntax to specify a schema name):
GRANT SELECT ON SCHEMA::[HumanResources] TO [Peter]
3. Click New Query. Right-click the query area and choose Connection | Change Connection. Connect using the SQL login Peter with a password of Pa$$w0rd. 4. Execute the following query to test SQL Server login Peter s access:
USE AdventureWorks GO SELECT * FROM Employee
2
Configuring SQL Server 2005
5. Notice that you get an Invalid Object error message, meaning that login Peter doesn t have the correct permissions to the Employee table. You need to solve this problem by running the following ALTER USER statement to assign HumanResources as the default schema for Peter so that he can select the Employee table directly without having to use the HumanResources schema name to qualify the table name:
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