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PostgreSQL: Features new in 7.4: Information Schema
- Schemas: Name space in a database.

- Information Schema: ANSI SQL method of describing database
- Set of views
- Schema name: information_schema
- Interesting views:
- information_schema.information_schema_catalog_name - current database
- information_schema.columns - columns for relation in the database, except system catalogs and columns of tables the user doesn't have access to
- information_schema.routines - all functions in the current database
- information_schema.schemata - all schemas in the current database that the user has access to
- information_schema.sql_features - all supported SQL standard features
- information_schema.sql_sizing - maximum size limits in the database
- information_schema.tables - all tables in the database which the user has access to
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