barcode generator vb.net download Assign privileges needed by all department users to the role. in Software

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Assign privileges needed by all department users to the role.
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GRANT SELECT, INSERT, DELETE, UPDATE ON ORDERS TO OPUSER; GRANT SELECT ON CUSTOMERS TO OPUSER; GRANT UPDATE (COMPANY, CUST_REP) ON CUSTOMERS TO OPUSER; GRANT SELECT ON SALESREPS TO OPUSER;
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Grant the role to Julio, Sumit, and Yolanda, the three current clerks in the Order Processing department.
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GRANT OPUSER TO JULIO, SUMIT, YOLANDA;
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Grant UPDATE on the SALESREPS table to role OPUSER. Note that all three users currently granted the role immediately acquire the new privilege.
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GRANT UPDATE ON SALESREPS TO OPUSER;
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A new employee, Francois, has joined the Order Processing department. Grant the OPUSER role to him. Note that he immediately acquires all the privileges in the role.
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GRANT OPUSER TO FRANCOIS;
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Yolanda has transferred to another department. Revoke the OPUSER role from her account.
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REVOKE OPUSER FROM YOLANDA;
Note that support for roles varies across SQL implementations. For example, as of this writing, MySQL does not appear to support roles. And in Oracle, a user needs the CREATE ROLE privilege before he or she can create new roles.
Part IV:
Database Structure
Summary
The SQL is used to specify the security restrictions for a SQL-based database: The SQL security scheme is built around privileges (permitted actions) that can be granted on specific database objects (such as tables and views) to specific user-ids (users or groups of users). Views also play a key role in SQL security because they can be used to restrict access to specific rows or specific columns of a table. The GRANT statement is used to grant privileges; privileges that you grant to a user with the GRANT OPTION can in turn be granted by that user to others. The REVOKE statement is used to revoke privileges previously granted with the GRANT statement. Roles can be used to assemble lists of privileges that can be granted to or revoked from users with a single command.
CHAPTER
The System Catalog
database management system must keep track of a great deal of information about the structure of a database to perform its data management functions. In a relational database, this information is typically stored in the system catalog, a collection of system tables that the DBMS maintains for its own use. The information in the system catalog describes the tables, views, columns, privileges, and other structural features of the database. Although the DBMS maintains the system catalog primarily for its own internal purposes, the system tables or views based on them are usually accessible to database users as well, through standard SQL queries or special commands supported by the DBMS. A relational database is thus self-describing; using queries against the system tables, you can ask the database to describe its own structure. General-purpose database front-ends, such as query tools and report writers, use this self-describing feature to generate lists of tables and columns for user selection, simplifying database access. This chapter describes the system catalogs provided by several popular SQL-based DBMS products and the information that the catalogs contain. It also describes the system catalog capabilities specified by the ANSI/ISO SQL standard.
What Is the System Catalog
The system catalog is a collection of special database tables that are owned, created, and maintained by the DBMS itself. These system tables contain data that describes the structure of the database. The tables in the system catalog are automatically created when the database is created. They are usually gathered under a special system user-id with a name like SYSTEM, SYSIBM, MASTER, or DBA. The DBMS constantly refers to the data in the system catalog while processing SQL statements. For example, to process a two-table SELECT statement, the DBMS must Verify that the two named tables actually exist. Ensure that the user has permission to access them. Check whether the columns referenced in the query exist. Resolve any unqualified column names to one of the tables. Determine the data type of each column.
Part IV:
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