Constraints in DB2 – Mainframe DB2 Tutorial – Part 10
DB2 for Mainframe z/OS is a relational database management system that runs on the mainframe.A relational database is a database in which all of the data is logically contained in tables. These databases are organized according to the relational model. In a relational database, referential integrity ensures data integrity by enforcing rules with referential constraints, check constraints, and triggers. You can rely on constraints and triggers to ensure the integrity and validity of your data, rather than relying on individual applications to do that work.DB2 is software that you can use to manage relational databases.
Constraints in DB2 – Mainframe DB2 Tutorial – Part 10, DB2 Constraints, It is a mechanism to control the Data:There are three types of Constraints.
NULL
NOT NULL
NOT NULL WITH DEFAULT
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