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18 Sep 2017 A foreign key is a set of columns in a table which are required to match at least one primary key of a row in another table. It is a referential constraint or referential integrity constraint. It is a logical rule about values in multiple columns in one or more tables. Selection from IBM Db2 11.1 Certification Guide [Book] Get unlimited access to videos, live online training, learning paths, books, tutorials, and more. Referential integrity constraints (also known as foreign key constraints or referential 18 Feb 2019 DB2 and Informix Dynamic Server - IBM; Oracle and RDB – Oracle; SQL Server and Access - Microsoft. In this tutorial, you will learn Referential integrity constraint state happens where relation refers to a key attribute of aReferential integrity (RI) is a relational database concept, which states that table relationships must always be consistent. In other words, any foreign key field 13 May 2010 Examine the various types of constraints supported by DB2 and explore NOT NULL; Unique; Primary key; Foreign key; Table check. There is The user_id column uses values that exist in the id column of the users table in order to connect the tables through the foreign key constraint we just created. 23 Mar 2010 Of the various constraints possible on relational tables, referential constraints are when implementing DBMS-enforced Referential Integrity. DB2® ensures referential integrity between your tables when you define referential constraints. Referential integrity is the state in which all values of all foreign keys are valid. Referential integrity is based on entity integrity . Entity integrity requires that each entity have a unique key. "Referential Integrity": Enforces referential constraints on insert, update, and delete A foreign key is a column or set of columns in a table that refer to a unique key . For more information on triggers, see "Creating a Trigger" and the Embedded SQL Programming Guide manual. [ DB2 List of Books | Search the DB2 Books ]