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VIEW_COLUMN_USAGE TABLE_CONSTRAINTS KEY_COLUMN_USAGE
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REFERENTIAL_ CONSTRAINTS CHECK_CONSTRAINTS CHECK_TABLE_USAGE CHECK_COLUMN_USAGE ASSERTIONS TABLE_PRIVILEGES COLUMN_PRIVILEGES CHARACTER_SETS COLLATIONS TRANSLATIONS SQL_LANGUAGES
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Table 16-13.
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Idealized System Catalog Used by the SQL2 Standard (continued)
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The System Catalog
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The SQL2 standard does not require a DBMS to actually support the system catalog tables in Table 16-13, 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 SQL2 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 SQL2 standard. In practice, major commercial SQL implementations have been slowly moving to support the SQL2 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 that the first 90 percent of the conformance to the SQL2 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 SQL2 catalog views expose the specific features and capabilities of the underlying DBMS. As a result, full support for the SQL2 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 SQL2 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 SQL2-defined system catalog views: List the names of all tables and views owned by the current user.
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DATABASE STRUCTURE SELECT TABLE_NAME FROM TABLES
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List the name, position, and data type of all columns in all views.
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SELECT TABLE_NAME, C.COLUMN_NAME, ORDINAL_POSITION, DATA_TYPE FROM COLUMNS WHERE (COLUMNS.TABLE_NAME IN (SELECT TABLE_NAME FROM VIEWS))
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Determine how many columns are in the table named OFFICES.
SELECT COUNT(*) FROM COLUMNS WHERE (TABLE_NAME = 'OFFICES')
SQL: The Complete Reference
System Catalog View
INFORMATION_SCHEMA_ CATALOG_NAME SCHEMATA
Contents
A single row specifying the name of the database for each user ( catalog in the language of the SQL2 standard) described by this Information Schema One row for each schema in the database that is owned by the current user specifying the schema name, default character set, and so on One row for each domain accessible by the current user specifying the name of the domain, the underlying data type, character set, maximum length, scale, precision, and so on One row for each domain constraint specifying the name of the constraint and its deferability characteristics One row for each table or view accessible to the current user specifying its name and type (table or view) One row for each view accessible to the current user specifying its name, check option, and updateability One row for each column accessible to the current user specifying its name, the table or view that contains it, its data type, precision, scale, character set, and so on One row for each privilege on a table granted to or by the current user specifying the table type, the type of privilege, the grantor and grantee, and whether the privilege is grantable by the current user One row for each privilege on a column granted to or by the current user specifying the table and the column, the type of privilege, the grantor and grantee, and whether the privilege is grantable by the current user One row for each usage granted to or by the current user
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