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At the bottom tier of the catalog hierarchy sit the schema objects. The schema objects are a set of related components that are contained within a schema. This is the level where the SQL data is stored and, consequently, the level that concerns SQL programmers the most. By using SQL, you ll be able to define SQL objects, modify those definitions, and store and manipulate SQL data within the objects. In fact, most of what you ll be doing in this book from here on in has a direct impact on or is directly connected with the schema objects. The SQL:2006 standard defines 12 types of schema objects. These objects, described in Table 2-2, provide the foundation for the SQL environment and the structure for the way in which data is stored within that environment. I ll be discussing most of these objects in greater detail later in the book; as a result, I ve included references, where appropriate, to the applicable chapters.

Part IV:

The SQL standard does not require a DBMS to actually support the system catalog tables it describes, or any system catalog at all Instead, it defines a series of views on these catalog tables that identify database objects that are accessible to the current user (These catalog views are called an Information Schema in the standard) Any DBMS that claims the Intermediate or Full conformance level to the SQL standard must support these views This effectively gives a user a standardized way to find out about the objects in the database that are available to him or her by issuing standard SQL against the catalog views Note that support for the catalog views is not required for the Entry conformance level to the SQL standard.

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represent a section named Error1 in your host language. The assumption will be that if an embedded SQL statement generates an exception, the program will jump to the Error1 section and take whatever action is defined in that section. Type the following embedded SQL statement into your text document:

In practice, major commercial SQL implementations have been slowly moving to support the SQL Information Schema, typically by defining corresponding views on the tables in their own system catalogs In most cases, the information in the DBMS own system catalogs is similar enough to that required by the standard, so that the first 90 percent of the conformance to the SQL standard is relatively easy The last 10 percent has proven to be much more difficult, given the variations among DBMS brands and the degree to which even the SQL catalog views expose the specific features and capabilities of the underlying DBMS As a result, full support for the SQL catalog views has usually been implemented in conjunction with a major new version of a DBMS product, accompanied by underlying changes in the core of the DBMS software.

The catalog views required by the SQL standard are summarized in Table 16-14, along with a brief description of the information contained in each view Here are some sample queries that can be used to extract information about database structure from the SQL-defined system catalog views: List the names of all tables and views owned by the current user..

EXEC SQL WHENEVER SQLEXCEPTION GOTO Error1;

SELECT TABLE_NAME FROM TABLES;

1:

Notice that the embedded SQL code contains a WHENEVER statement that specifies the SQLEXCEPTION and GOTO options.

SELECT TABLE_NAME, COLUMN_NAME, ORDINAL_POSITION, DATA_TYPE FROM COLUMNS WHERE (COLUMNS.TABLE_NAME IN (SELECT TABLE_NAME FROM VIEWS));

SELECT COUNT(*) FROM COLUMNS WHERE (TABLE_NAME = 'OFFICES');

variables defined in your declaration section. In addition, a singleton SELECT statement will be used because the statement will retrieve only one row at a time. The WHERE clause is based on a specified COMPACT_DISC_ID value, and each value is unique within the COMPACT_ DISCS table. (The COMPACT_DISC_ID column is the primary key, so values must be unique within that column.) Type the following embedded SQL statement into your text document:

Note that for MySQL, the view names must be qualified with schema name INFORMATION_SCHEMA (for example, INFORMATION_SCHEMA.TABLES) unless you are already in that database. For example:

SELECT TABLE_NAME FROM INFORMATION_SCHEMA.TABLES;

FROM COMPACT_DISCS WHERE COMPACT_DISC_ID = :v_CD_ID;

The standard also defines four domains that are used by the catalog views and that also are available to users. These domains are summarized in Table 16-15.

Notice that an INTO clause is included in this statement. The INTO clause contains the output data variables and their associated indicator variables. Your text document should now look like the following code:

16:

System Catalog View ADMINISTRATIVE_ ROLE_ AUTHORIZATIONS APPLICABLE_ROLES ASSERTIONS ATTRIBUTES CHARACTER_SETS CHECK_CONSTRAINT_ ROUTINE_USAGE CHECK_CONSTRAINTS COLLATIONS COLLATION_ CHARACTER_ SET_APPLICABILITY COLUMN_COLUMN_USAGE COLUMN_DOMAIN_USAGE COLUMN_PRIVILEGES

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