barcode generator vb.net download Column Name CONSTNAME TABSCHEMA TABNAME COLNAME COLSEQ in Software

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Column Name CONSTNAME TABSCHEMA TABNAME COLNAME COLSEQ
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TABLE 16-9
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Data Type VARCHAR(128) VARCHAR(128) VARCHAR(128) VARCHAR(128) SMALLINT
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Information 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 (first column = 1)
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The SYSCAT.KEYCOLUSE View (DB2)
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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;
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The DB2 catalog support for primary and foreign keys is typical of that found in other major SQL products. The Oracle system ALL_CONSTRAINTS and USER_CONSTRAINTS views, for example, provide 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 ALL_CONS_COLUMNS and USER_CONS_COLUMNS system views, which are analogous to the DB2 SYSCAT.KEYCOLUSE system table. Microsoft SQL Server has a similar catalog structure, with foreign key information divided between the SYS. FOREIGN_KEYS and SYS.FOREIGN_KEY_COLUMNS catalog views. 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.
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PART IV
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. SQL Server stores user information in its SYS.DATABASE_PRINCIPALS catalog view, 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
Part IV:
Database Structure
Column Name name principal_id type
Data Type sysname int char(1)
Information Name of the principal, unique within the database ID of the principal, unique within the database Principal type: S = SQL user U = Windows user G = Windows group A = Application role R = Database role C = User mapped to a certificate K= User mapped to an asymmetric key Description of principal type Name to be used when SQL name does not specify a schema Date and time when the principal was created Date and time when the principal was last modified ID of the principal that owns this principal Security identifier (SID) if the principal is defined external to the database (types S, U, and G) If 1, then row represents an entry for one of the fixed roles such as db_owner
type_desc default_schema_name create_date modify_date owning_principal_id sid is_fixed_role
nvarchar(60) sysname datetime datetime int varbinary(85) bit
TABLE 16-10 Columns of the SYS.DATABASE_PRINCIPALS Catalog View (SQL Server)
called SYSUSERS. The corresponding Oracle table is called DBA_USERS. Following are two equivalent queries that list the authorized users for SQL Server and Oracle: List all the user-ids known to a SQL Server database.
SELECT NAME FROM SYS.DATABASE_PRINCIPALS;
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