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CONSTNAME TABSCHEMA TABNAME COLNAME COLSEQ Table 16-9.
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VARCHAR(18) CHAR(8) VARCHAR(18) VARCHAR(18) SMALLINT
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Name of constraint (unique, primary key, or foreign key) described by this row Schema containing the constraint Table to which constraint applies Name of column in the constraint Position of column within the constraint
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The SYSCAT.KEYCOLUSE View (DB2)
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The value in this column indicates the position (1, 2, and so on) of the primary key column within the primary key. You can query the SYSCAT.COLUMNS table to find a table s primary key: List the columns that form the primary key of the PRODUCTS table.
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SELECT FROM WHERE AND ORDER COLNAME, KEYSEQ, TYPENAME, REMARKS SYSCAT.COLUMNS TABNAME = 'PRODUCTS' KEYSEQ > 0 BY KEYSEQ
The DB2 catalog support for primary and foreign keys is typical of that found in other major SQL products. The Oracle system view USER_CONSTRAINTS, for example, provides the same information as the DB2 SYSCAT.REFERENCES system table. Information about the specific columns that make up a foreign key or primary key appears in the Oracle USER_CONS_COLUMNS system view, which is analogous to the DB2 SYSCAT.KEYCOLUSE system table. Microsoft SQL Server has a similar system catalog structure, with foreign key information divided between the SYSFOREIGNKEYS and SYSREFERENCES system tables. Informix Universal Server takes a similar approach to the DB2 catalog, but with the same types of differences previously illustrated in its table information and column information support. Each constraint defined within the database generates one row in the Informix SYSCONSTRAINTS system table, which defines the name of the constraint and its type (check constraint, primary key, referential, and so on). This system table also assigns an internal constraint-id number to identify the constraint within the catalog. The table to which the constraint applies is also identified by table-id (which serves as a foreign key to the SYSTABLES system table). Further information about the referential constraints (foreign keys) is contained in a SYSREFERENCES system table. Again in this table, the constraint, the primary key, and the parent table are identified by internal IDs that link the foreign key information to the SYSCONSTRAINTS and SYSTABLES system tables. The SYSREFERENCES table contains information about the delete rule and update rule that apply to the foreign key relationship and similar information.
User Information
The system catalog generally contains a table that identifies the users who are authorized to access the database. The DBMS may use this system table to validate the user name and password when a user first attempts to connect to the database. The table may also store other data about the user.
16:
The System Catalog
SQL Server stores user information in its SYSUSERS system table, shown in Table 16-10. Each row of this table describes a single user or user group in the SQL Server security scheme. Informix takes a similar approach, with a system table that is also called SYSUSERS. The corresponding Oracle table is called ALL_USERS. Following are two equivalent queries that list the authorized users for SQL Server and Oracle: List all the user-ids known to SQL Server.
SELECT NAME FROM SYSUSERS WHERE UID <> GID
List all the user-ids known to Oracle.
SELECT USERNAME FROM ALL_USERS
The DB2 system catalog table that contains user names also contains the information about their roles and privileges within the database (that is, whether they are a database administrator, whether they can create tables, whether they can create programs that access the database). Here is the equivalent query to the preceding queries for retrieving user names from the DB2 catalog: List all the user-ids known to DB2.
DATABASE STRUCTURE SELECT DISTINCT GRANTEE FROM SYSCAT.DBAUTH WHERE GRANTEETYPE = 'U'
Column Name
uid gid name Table 16-10.
Data Type
SMALLINT SMALLINT SYSNAME
Information
Internal user-id number in this database Internal user group-id number in this database User or group name
Selected Columns of the SYSUSERS Table (SQL Server)
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