Examples of Business-Critical Integrity Constraints. Databases contain integrity constraints to prevent chaotic events from happening, such as shipping a product to a customer with no address ...

Example 2: Creating Integrity Constraints with the SQL Procedure. The following sample program creates integrity constraints using the SQL procedure. The data file PEOPLE lists employees and contains ...

config.active_record.schema_format = :sql Simply put, sexy_pg_constraints adds a number of additional attributes that you can pass to an add_column or change_column invocation within your migration.

By using cascading referential integrity constraints, you can define the actions that SQL Server 2005 takes when a user tries to delete or update a key to which existing foreign keys point. Skip ...