SET SESSION CONSTRAINT Examples | Teradata Vantage - Constraint Definitions for the Examples - Advanced SQL Engine - Teradata Database

The following constraint and user definitions are used for the examples that follow.

The following SQL text creates a hierarchical constraint named classification_level that enforces all four of the possible statement actions for a constraint.

     CREATE CONSTRAINT classification_level SMALLINT, NOT NULL,
     VALUES (top_secret:4, secret:3, confidential:2, unclassified:1), 
     INSERT SYSLIB.insert_level,
     UPDATE SYSLIB.update_level,
     DELETE SYSLIB.delete_level,
     SELECT SYSLIB.read_level;

The following SQL text creates a non-hierarchical constraint named classification_category that enforces all four of the possible statement actions for a constraint.

     CREATE CONSTRAINT classification_category BYTE(8),  
     VALUES (nato:1, united_states:2, canada:3, united_kingdom:4,
             france:5, norway:6, russia:7), 
     INSERT SYSLIB.insert_category,
     UPDATE SYSLIB.update_category,
     DELETE SYSLIB.delete_category,
     SELECT SYSLIB.read_category;

Create user_name.

     CREATE USER  user_name  AS
     PERMANENT = 1e6, 
     PASSWORD=my_pwd,
     CONSTRAINT = classfication_level (top_secret),
     CONSTRAINT = classification_category (united_states);

Creates user pls.

     CREATE USER  pls  AS
     PERMANENT = 1e6, 
     PASSWORD=secret,
     CONSTRAINT = classification_level (secret, unclassified DEFAULT),
     CONSTRAINT = classification_category (united_states);

The following SQL text creates user arn_anderson.

     CREATE USER  arn_anderson  AS
     PERMANENT = 1e6, 
     PASSWORD=Arn2222ANDERSON,
     CONSTRAINT = classification_category (norway);