Представление CONSTRAINT_COLUMN_USAGE
Представление идентифицирует столбцы, используемые в ссылочных ограничениях, ограничениях уникальности, проверочных ограничениях и утверждениях целостности, которые определены в данном каталоге и принадлежат данному пользователю. Определение представления:
CREATE VIEW CONSTRAINT_COLUMN_USAGE AS SELECT TABLE_CATALOG, TABLE_SCHEMA, TABLE_NAME, COLUMN_NAME, CONSTRAINT_CATALOG, CONSTRAINT_SCHEMA, CONSTRAINT_NAME FROM ((SELECT TABLE_CATALOG, TABLE_SCHEMA, TABLE_NAME, COLUMN_NAME, CONSTRAINT_CATALOG, CONSTRAINT_SCHEMA, CONSTRAINT_NAME FROM DEFINITION_SCHEMA.CHECK_COLUMN_USAGE) UNION (SELECT K.TABLE_CATALOG, K.TABLE_SCHEMA, K.TABLE_NAME, K.COLUMN_NAME, CONSTRAINT_CATALOG, CONSTRAINT_SCHEMA, CONSTRAINT_NAME FROM DEFINITION_SCHEMA.TABLE_CONSTRAINTS JOIN DEFINITION_SCHEMA.KEY_COLUMN_USAGE AS K USING (CONSTRAINT_CATALOG, CONSTRAINT_SCHEMA, CONSTRAINT_NAME)) JOIN DEFINITION_SCHEMA.SCHEMATA ON ((TABLE_CATALOG, TABLE_SCHEMA) = (CATALOG_NAME, SCHEMA_NAME)) WHERE SCHEMA_OWNER = CURRENT_USER AND CONSTRAINT_CATALOG = (SELECT CATALOG_NAME FROM INFORMATION_SCHEMA_CATALOG_NAME)
