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This chapter described the SQL Data Definition Language features that define and change the structure of a database: I The CREATE TABLE statement creates a table and defines its columns, primary key, and foreign keys. I The DROP TABLE statement removes a previously created table from the database. I The ALTER TABLE statement can be used to add a column to an existing table and to change primary key and foreign key definitions. I The CREATE INDEX and DROP INDEX statements define indexes, which speed database queries but add overhead to database updates. I Most DBMS brands support other CREATE, DROP, and ALTER statements used with DBMS-specific objects. I The SQL2 standard specifies a database schema containing a collection of tables, and the database schema is manipulated with CREATE SCHEMA and DROP SCHEMA statements. I Various DBMS brands use very different approaches to organizing the one or more databases that they manage, and these differences affect the way you design your databases and gain access to them.

which links up the three hydrocarbon chains. This backbone breaks off from the chains to form glycerol, and this accounts for the glyceride bit of the name. Our methoxide mixture which was added to our triglycerides catalyzed a reaction where the three chains broke off from the backbone. The glycerol backbone is heavy, so settles to the bottom of the jar, whereas the lighter hydrocarbon chains float to the top of the jar and it is these which form our biodiesel.

14

he tables of a database define the structure and organization of its data. However, SQL also lets you look at the stored data in other ways by defining alternative views of the data. A view is a SQL query that is permanently stored in the database and assigned a name. The results of the stored query are visible through the view, and SQL lets you access these query results as if they were, in fact, a real table in the database. Views are an important part of SQL for several reasons: I Views let you tailor the appearance of a database so that different users see it from different perspectives. I Views let you restrict access to data, allowing different users to see only certain rows or certain columns of a table. I Views simplify database access by presenting the structure of the stored data in the way that is most natural for each user. This chapter describes how to create views and how to use views to simplify processing and enhance the security of a database.

REVOKE SELECT ON MPAA_RATING FROM PUBLIC;

A view is a virtual table in the database whose contents are defined by a query, as shown in Figure 14-1. To the database user, the view appears just like a real table, with a set of named columns and rows of data. But unlike a real table, a view does not exist in the database as a stored set of data values. Instead, the rows and columns of data visible through the view are the query results produced by the query that defines the view. SQL creates the illusion of the view by giving the view a name like a table name and storing the definition of the view in the database. The view shown in Figure 14-1 is typical. It has been given the name REPDATA and is defined by this two-table query:

SELECT NAME, CITY, REGION, QUOTA, SALESREPS.SALES FROM SALESREPS, OFFICES WHERE REP_OFFICE = OFFICE

The data in the view comes from the SALESREPS and OFFICES tables. These tables are called the source tables for the view because they are the source of the data that is visible through the view. This view contains one row of information for each salesperson, extended with the name of the city and region where the salesperson works. As shown in the figure, the view appears as a table, and its contents look just like the query results that you would obtain if you actually ran the query.

14:

With all databases, you want to avoid giving database users more privileges than they need to do their job This not only prevents errors made by humans from becoming data disasters (including those errors contained in the application programs and database queries they write), but it also keeps people honest In Microsoft SQL Server and Sybase Adaptive Server, you want to avoid having database users connect as the sa user You want to create database logins that have the minimal privileges required Sadly, this is often not done, and applications connect as sa or to a database with a user account that has the DBO (database owner) or DBA (database administrator) role Roles are a collection of privileges and are discussed in an upcoming section.

Figure 14-1.