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.

A unique constraint is a database design feature that ensures that no two rows in a table have the same values for a set of columns. It helps to prevent data duplication, enforce data integrity ...

Adds columns to, drops columns from, and changes column attributes in an existing table. Adds, modifies, and drops integrity constraints from an existing table. Restriction: You cannot use any type of ...

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 ...

is the name for the constraint being specified. The first form of the CREATE TABLE statement creates tables that automatically map SQL data types to those supported by the SAS System. Use this form ...