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PARTITION_MODE CHAR(1) Table 16-2.
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The SYSCAT.TABLES View (DB2) (continued)
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LOG_ATTRIBUTE PCTFREE REMARKS Table 16-2.
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Whether logging is initially enabled for table Percentage of page to reserve for future data
VARCHAR(254) User-provided comments for table
The SYSCAT.TABLES View (DB2) (continued)
You can use queries like the following examples to find out information about the tables in a DB2 database. Similar queries, using different table and column names, can be used to obtain the same information from other DBMS brands. List the names and owners of all tables in the database.
SELECT DEFINER, TABNAME FROM SYSCAT.TABLES WHERE TYPE = 'T'
List the names of all tables, views, and aliases in the database.
SELECT TABNAME FROM SYSCAT.TABLES
List the names and creation times of only my tables.
SELECT FROM WHERE AND TABNAME, CREATE_TIME SYSCAT.TABLES TYPE = 'T' DEFINER = USER
In an Oracle database, a pair of system views named USER_TABLES and ALL_TABLES perform a similar function to the DB2 SYSCAT.TABLES view. The USER_TABLES view contains one row for each database table that is owned by the current user. The ALL_TABLES view contains one row for each table to which the current user has access. The ALL_TABLES view thus will include all of the rows from USER_TABLES, plus additional rows representing tables owned by other users to
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The System Catalog
which the current user has been granted at least one of the access privileges. Here is a typical query against these Oracle system catalog views: List the names and owners of all tables to which I have access.
SELECT TABLE_NAME, OWNER FROM ALL_TABLES
The SQL Server equivalent of the DB2 SYSCAT.TABLES view is a system table named SYSOBJECTS, described in Table 16-3. The SYSOBJECTS table stores information about SQL Server tables and views and other SQL Server objects such as stored procedures, rules, and triggers. Note also how the SYSOBJECTS table uses an internal ID number instead of a name to identify the table owner. The Informix Universal Server system table that gives information about tables is named SYSTABLES. Like the DB2 catalog, it contains information only about tables, views, and aliases; other database objects are described in other system tables. Here is a typical query against this Informix system table: List the name, owner, and creation date of all tables in the database.
SELECT TABNAME, OWNER, CREATED FROM SYSTABLES WHERE TABTYPE = 'T'
DATABASE STRUCTURE
Column Name
Name Id Uid Type crdate deltrig instrig updtrig
Data Type
SYSNAME INT SMALLINT CHAR(2) DATETIME INT INT INT
Information
Name of the object Internal object ID number User-id of object owner Object type code1 Date/time object was created Procedure ID of DELETE trigger Procedure ID of INSERT trigger Procedure ID of UPDATE trigger
S = system table, U = user table, V = view, L = log, P = stored procedure, TR = trigger, and so on
Table 16-3.
Selected Columns of the SYSOBJECTS Table (SQL Server)
SQL: The Complete Reference
As these examples show, the queries to obtain table information have a similar structure across DBMS brands. However, the specific names of the system table(s) or view(s) containing the information, and the relevant columns, vary considerably across brands.
Column Information
All of the major SQL products have a system table that keeps track of the columns in the database. There is one row in this table for each column in each table or view in the database. Most DBMS brands restrict access to this base system table, but provide user column information through a view that shows only columns in tables owned by, or accessible to, the current user. In an Oracle database, two system catalog views provide this information USER_TAB_COLUMNS, which includes one row for each column in each table owned by the current user, and ALL_TAB_COLUMNS, which contains one row for each column in each table accessible to the current user. Most of the information in the system columns table or view stores the definition of a column its name, its data type, its length, whether it can take NULL values, and so on. In addition, the table sometimes includes information about the distribution of data values found in each column. This statistical information helps the DBMS decide how to carry out a query in the optimal way. Here is a typical query you could use to find out about the columns in an Oracle database: List the names and data types of the columns in my OFFICES table.
SELECT COLUMN_NAME, DATA_TYPE FROM USER_TAB_COLUMNS WHERE TABLE_NAME = 'OFFICES'
Like the table information in the system catalog, the column information varies across DBMS brands. Table 16-4 shows the contents of the SYSCAT.COLUMNS system table, which contains column information in the DB2 catalog. Here are some queries that apply to this DBMS brand: Find all columns in the database with a DATE data type.
SELECT TABSCHEMA, TABNAME, COLNAME FROM SYSCAT.COLUMNS WHERE TYPESCHEMA = 'SYSIBMD' AND TYPENAME = 'DATE'
List the owner, view name, column name, data type, and length for all text columns longer than ten characters defined in views.
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