Define the term constraint. classify the two types of constrains.
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A constraint is a rule that is used for optimization purposes. There are five types of constraints: A NOT NULL constraint is a rule that prevents null values from being entered into one or more columns within a table. ... You can use a primary key and foreign key constraints to define relationships between tables.
Types of constraints - IBM DB2 9.7 for Linux, UNIX
Types of constraints - IBM DB2 9.7 for Linux, UNIX
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