Unique-constraint is an index that sets one or multiple fields to be unique in a data entity
I am trying to create a unique constraint across multiple tables. I have found similar questions answered here but they …
sql-server database-design unique-constraintSuppose the following DB migration in Ruby: create_table :question_votes do |t| t.integer :user_id t.integer :question_…
ruby-on-rails validation model unique-constraintI have a few non-unique constraints that I want to alter into unique constraints ( business rules have changed since the …
oracle oracle10g constraints unique-constraintI want to persist my entity with ManyToMany relation. But i have some problem during persisting process. My entities : @Entity @…
java jpa many-to-many unique-constraint duplicatesI need to drop a unique constraint from a postgresql table, but I didn't give it a name in the …
sql postgresql constraints unique-constraintI'm trying to remove duplicates from a MySQL table using ALTER IGNORE TABLE + an UNIQUE KEY. The MySQL documentation says: …
mysql unique-constraintWorking on some legacy hibernate code. How do I do the following with hbm.xml(hibernate mapping file) instead of …
hibernate persistence constraints unique-constraint hibernate-mappingIs there way in MySQL to have two unique keys and connect them somehow? for example if i have the …
mysql unique-constraintI have little application which allows a user to rate a video. The user can rate only once. So I …
django save unique-constraint insert-updateWhat is the diffrence between a unique index and a unique key?
sql-server database-design unique-constraint unique-index