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new view. Yes, you can create a view based on another view! It provides unparalleled exibility. Here is the example:
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CREATE VIEW CHILDRENS_MOVIE_LISTING AS SELECT * FROM MOVIE_LISTING WHERE RATING IN ('G','PG','PG-13')
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Using the same select you used against MOVIE_LISTING, here is the new result:
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SELECT GENRE, RATING, MOVIE_TITLE FROM CHILDRENS_MOVIE_LISTING ORDER BY GENRE, RATING, MOVIE_TITLE; GENRE -------------------Action and Adventure Action and Adventure Action and Adventure Action and Adventure Comedy Comedy Comedy Comedy Drama Romance Romance 11 rows selected. RATING -----PG-13 PG-13 PG-13 PG-13 PG-13 PG-13 PG-13 PG-13 PG-13 PG-13 PG-13 MOVIE_TITLE ----------------------------Master and Commander: The Far Pirates of the Caribbean: The The Day After Tomorrow The Italian Job 50 First Dates Matchstick Men Something's Gotta Give The School of Rock Big Fish 13 Going on 30 Two Weeks Notice
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Notice how the WHERE clause in the CHILDRENS_MOVIE_LISTING view blocks the unwanted rows from the query results. However, a word of caution on creating views based on other views: the CHILDRENS_MOVIE_LISTING view is dependent on the MOVIE_LISTING view and may become invalid or otherwise malfunction any time the MOVIE_LISTING view is changed. Without a bit of planning and control, a house of cards can result that will fall down every time changes are made. Nevertheless, views are a powerful tool that simply cannot be ignored.
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Most RDBMS products come with a set of catalog views that allow query access to the metadata that describes the database objects contained in the database. Experienced database administrators know how to use the data in the catalog to their advantage and actually use SQL statements to generate other SQL statements.
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In Oracle, the USER_TABLES view contains information about each table that belongs to the current database user. You can use the command DESCRIBE USER_TABLES to see the de nition of the view, or refer to the Oracle Server Reference manual for descriptions of this and other catalog views. Here is an SQL statement that creates a DROP TABLE command for every table found in USER_TABLES. The WHERE clause was added to eliminate some Oracle internal tables that might otherwise appear in the result set. There are also techniques available for sending the query results to a le that can then be used as a script, but they are beyond the scope of this text (see the Oracle SQL*Plus SPOOL command for details).
SELECT 'DROP TABLE ' || TABLE_NAME || ' CASCADE CONTRAINTS;' AS SQL FROM USER_TABLES WHERE TABLE_NAME NOT LIKE 'BIN$%'; SQL ------------------------------------------------------DROP TABLE MOVIE_RENTAL CASCADE CONSTRAINTS; DROP TABLE CUSTOMER_TRANSACTION CASCADE CONSTRAINTS; DROP TABLE CUSTOMER_ACCOUNT_PERSON CASCADE CONSTRAINTS; DROP TABLE EMPLOYEE CASCADE CONSTRAINTS; DROP TABLE MOVIE_LANGUAGE CASCADE CONSTRAINTS; DROP TABLE MOVIE_COPY CASCADE CONSTRAINTS; DROP TABLE MOVIE CASCADE CONSTRAINTS; DROP TABLE PERSON CASCADE CONSTRAINTS; DROP TABLE MPAA_RATING CASCADE CONSTRAINTS; DROP TABLE MOVIE_GENRE CASCADE CONSTRAINTS; DROP TABLE LANGUAGE CASCADE CONSTRAINTS; DROP TABLE CUSTOMER_ACCOUNT CASCADE CONSTRAINTS;
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Microsoft uses the term system tables for the SQL Server tables that contain metadata. You can nd descriptions of them in Books Online under the topic system tables. Here is the SQL Server equivalent of the previous example (dropping all tables) using the SQL Server SYSOBJECTS table. The WHERE clause lters out all objects except those with the user table object type.
SELECT 'DROP TABLE ' + NAME + ';' FROM SYSOBJECTS WHERE XTYPE='U' DROP DROP DROP DROP DROP DROP DROP DROP DROP DROP DROP DROP TABLE TABLE TABLE TABLE TABLE TABLE TABLE TABLE TABLE TABLE TABLE TABLE PERSON; MOVIE; MOVIE_COPY; MOVIE_LANGUAGE; EMPLOYEE; CUSTOMER_ACCOUNT_PERSON; CUSTOMER_TRANSACTION; MOVIE_RENTAL; CUSTOMER_ACCOUNT; LANGUAGE; MOVIE_GENRE; MPAA_RATING;
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N OTE : These generated DROP statements won t run without some additional work because of the referential constraints. SQL Server doesn t support the CASCADE CONSTRAINTS clause with the DROP command, so the referential constraints would have to be dropped before the tables could be, or the DROP statements would have to be placed in the proper order before being run.
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