Defining relationships with referential constraints
“Referential integrity and referential constraints” on page 54 introduces referential integrity. Referential integrity is a condition in which all intended references from data in one table column to data in another table column are valid. By using referential constraints, you can define relationships between entities that you define in DB2. 
Organizations that choose to enforce referential constraints have at least one thing in common. They need to ensure that values in one column of a table are valid with respect to other data values in the database.
Examples:
A manufacturing company wants to ...
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