Another useful query using these two constraints-related views is one that provides information on referential integrity constraints (CONSTRAINT_TYPE of R).

Today, one is likely to find many relational database implementations that simply do not even take the time to define referential integrity constraints. People are considering referential integrity as ...

Data types and check constraints function by restricting values for a column, just like referential integrity, as in Foreign Keys, operates similarly. Some level of design confusion does exist because ...