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VIEWSCHEMA VIEWNAME DEFINER SEQNO VIEWCHECK READONLY VALID FUNC_PATH TEXT Table 16-6.
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CHAR(8) VARCHAR(18) CHAR(8) SMALLINT CHAR(1) CHAR(1) CHAR(1) VARCHAR(254) VARCHAR(3600)
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Schema containing the view Name of the view User-id of person who created the view Sequence number for this row of SQL text Type of view checking Whether view is read-only (Y/N) Whether view definition is valid (Y/N) Path for resolving function calls in view SQL text of view definition ( SELECT )
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The SYSCAT.VIEWS View (DB2)
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VIEWSCHEMA VIEWNAME DEFINER BTYPE BSCHEMA TABAUTH
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Information
Schema containing the view Name of the view User-id of person who created the view Type of object on which view depends (T = table, V = view, A = alias, and so on) Schema containing the object on which view depends Flags indicating privileges on the object on which view depends
Table 16-7.
The SYSCAT.VIEWDEP View (DB2)
16:
The System Catalog
against the DB2 VIEWS system table to obtain the names and creators of all views defined in the database: List the views defined in the database.
SELECT DISTINCT VIEWSCHAME, VIEWNAME, DEFINER FROM SYSCAT.VIEWS
Note the use of DISTINCT to eliminate duplicate rows that would be present for views with long text definitions. Perhaps an easier way to obtain the same information is to query the DB2 TABLES system table directly, selecting only rows representing views, as indicated by the TYPE value: List the views defined in the database.
SELECT TABSCHEMA, TABNAME, DEFINER FROM SYSCAT.TABLES WHERE TYPE = 'V'
Most of the major DBMS products treat views in this same way within their system catalog structure. Informix Universal Server, for example, has a system table named SYSVIEWS that contains view definitions. Each of its rows holds a 64-character chunk of the SQL SELECT statement that defines a view. View definitions that span multiple rows are handled by sequence numbers, as with DB2. The Informix SYSVIEWS table includes only one other column the table-id that links the SYSVIEWS table to the corresponding row in the SYSTABLES table. Thus, Informix duplicates less information between the SYSTABLES and SYSVIEWS tables, but you must explicitly join the tables for the most common view information requests. Oracle takes a similar approach by making the SQL text that defines a view available via system views. As with table and column information, there are two system views of interest: USER_VIEWS, which contains information about all views created and owned by the current user, and ALL_VIEWS, which also includes information about views accessible to the current user but created by other users. Unlike the DB2 and Informix approaches, which split the SQL text defining the view into multiple rows with sequence numbers if it is lengthy, Oracle s system views contain only one row per view. The SQL text defining the view is held in a LONG (large object) column and can conceivably run to thousands of characters. A length column tells the length of
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the stored SQL text definition of the view. Here is a query to obtain Oracle view information: List the current user s views and their definitions.
SELECT VIEW_NAME, TEXT_LENGTH, TEXT FROM USER_VIEWS
Note that most interactive SQL products (including Oracle s) truncate the text containing the view definition if it is too long to be displayed effectively. The actual text stored in the database is complete.
Remarks
IBM s DB2 products allow you to associate up to 254 characters of remarks with each table, view, and column defined in the database. The remarks allow you to store a brief description of the table or data item in the system catalog. The remarks are stored in the SYSCAT.TABLES and SYSCAT.COLUMNS system tables of the system catalog. Unlike the other elements of table and column definitions, the remarks and labels are not specified by the CREATE TABLE statement. Instead, the COMMENT statement is used. Its syntax is shown in Figure 16-2. Here are some examples: Define remarks for the OFFICES table.
COMMENT ON TABLE OFFICES IS 'This table stores data about our sales offices'
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