Cross-table constraints in SQL? syncrotic Mar 29, 2010 Jump to latest Follow Reply ...

Check constraints are a powerful feature of SQL that allow you to enforce data integrity rules on your tables. They can help you prevent invalid or inconsistent data from entering your database ...

-- CONSTRAINTS -- --------------- -- Constraints can be at column level or table level. -- They are used to specify rules for the data in a table by limiting the type of data that can go into a table.

Reifying a constraint c consists in associating a Boolean variable b with c such that c is satisfied if and only if b is true, which can be denoted by c^{reif}: c <;=> b. Reification is useful for ...