Mysql automatically updating foreign keys
A foreign key is a constraint which can be used to enforce data integrity.
The purpose of inducing constraints is to enforce the integrity of a database.
For an introduction to installation, configuration and use of the My SQL database see the Yo Linux My SQL tutorial.
My SQL is by far the most popular database management system for small- to medium-sized web projects.
The column level constraints can apply only to one column where as table level constraints are applied to the entire table.
My SQL CONSTRAINT is declared at the time of creating a table.
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My SQL CONSTRAINTs are : The UNIQUE constraint in My SQL does not allow to insert a duplicate value in a column.