Referential integrity is a property of data which requires the value of an attribute/column of a relation table to exist as a value of another attribute/column in another relation table
I remember hearing Joel Spolsky mention in podcast 014 that he'd barely ever used a foreign key (if I remember correctly). …
database database-design foreign-keys referential-integrity data-integrityI have a table with this layout: CREATE TABLE Favorites ( FavoriteId uuid NOT NULL PRIMARY KEY, UserId uuid NOT NULL, …
sql postgresql database-design null referential-integrityI'm piecing together an image website. The basic schema's pretty simple MySQL, but I'm having some trouble trying to represent …
mysql database null foreign-keys referential-integrityI have a table user with userID as the primary key. I have another table called Friends. In the Friends …
mysql sql foreign-keys primary-key referential-integrityFirst, sorry for my poor English... I got four entities : User, Application, Bundle & Entity. Here are their relations (with …
symfony doctrine-orm cascading referential-integrityAssuming I have two tables: users and orders. A user has many orders, so naturally there is a foreign key …
ruby-on-rails postgresql referential-integrityI have the following database schema: members_company1(id, name, ...); members_company2(id, name, ...); profiles(memberid, membertypeid, ...); membertypes(id, name, ...) [ { …
sql sql-server tsql foreign-keys referential-integrityI would like to add a constraint that will check values from related table. I have 3 tables: CREATE TABLE somethink_…
postgresql database-design foreign-keys constraints referential-integrityAs in this question, I've been reading PoEAA and wondering if it's possible to defer referential integrity checks until commit …
mysql referential-integrityIn a PostgreSQL 9.3 database, if I define tables a and b as follows: CREATE TABLE a(i integer); ALTER TABLE …
sql postgresql database-design foreign-keys referential-integrity