When I am working with an Oracle database, I still find myself using SQL*Plus for many quick and dirty database queries. In particular, I often look up constraints in SQL*Plus. In this post, I ...

By defining referential constraints, you can set up the database to control the semantic accuracy of the data it contains. To define a referential constraint, you must create a primary key in the ...

However, it is often necessary to defer constraint enforcement - during a database migration for example or loading a relational schema with cyclic foreign key dependencies.