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Questions tagged unique-constraint

19 questions

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40
votes
3
answers

How to give a unique constraint to a combination of columns in Oracle?

sql oracle-database constraints unique-constraint composite-key
asked 2013-06-27T12:43:08.430
81
votes
3
answers

MySQL delete multiple rows in one query conditions unique to each row

mysql unique-constraint multiple-records
asked 2013-02-15T22:00:39.790
21
votes
5
answers

mysql combined unique keys

mysql unique-constraint
asked 2012-08-25T21:16:30.310
19
votes
5
answers

Does Entity Framework 5 support unique constraints?

unique-constraint .net-4.5 entity-framework-5
asked 2012-08-05T20:07:38.527
8
votes
3
answers

Symfony2 UniqueConstraint and UniqueEntity (Integrity Violation)

symfony doctrine entity unique unique-constraint
asked 2012-06-20T08:44:11.930
18
votes
3
answers

Unique constraint violation during insert: why? (Oracle)

oracle-database unique-constraint
asked 2011-09-27T14:57:16.680
20
votes
2
answers

Unique combination of fields in SQLite?

python sqlite database-design unique-constraint
asked 2011-09-13T19:40:52.510
81
votes
3
answers

Unique Key Violation in SQL Server - Is it safe to assume Error 2627?

sql-server-2005 unique-constraint
asked 2011-06-26T11:47:11.187
9
votes
2
answers

How to do multiple column unique-constraint in ormlite ( SQLite )

sql sqlite unique-constraint ormlite
asked 2011-03-10T18:50:35.453
173
votes
7
answers

How can I create a unique constraint on my column (SQL Server 2008 R2)?

sql sql-server sql-server-2008 unique-constraint
asked 2011-03-03T14:16:06.210
31
votes
1
answers

Should I specify both INDEX and UNIQUE INDEX?

postgresql indexing unique-constraint unique-index
asked 2010-12-25T21:07:25.280
16
votes
2
answers

How to define a "unique" constraint on a column of MySQL table in Ruby on Rails 3?

mysql ruby-on-rails ruby-on-rails-3 unique unique-constraint
asked 2010-12-10T03:50:00.557
10
votes
5
answers

Add a unique constraint of a sql table as foreign key reference to an another sql table

sql-server unique-constraint
asked 2010-11-19T12:39:06.470
442
votes
7
answers

Does MySQL ignore null values on unique constraints?

mysql database unique-constraint
asked 2010-09-14T19:29:22.187
10
votes
2
answers

Unique constraint using data in multiple tables (SQL / SQLAlchemy)

python sql sqlalchemy unique-constraint
asked 2010-08-20T22:07:51.643
15
votes
1
answers

How to specify that a combination of columns should be a unique constraint using annotations?

hibernate jpa annotations unique-constraint
asked 2010-08-17T16:00:18.783
206
votes
5
answers

SQLite table constraint - unique on multiple columns

sqlite unique-constraint compound-key
asked 2010-04-23T20:45:37.420
17
votes
2
answers

Finding ghost constraint from Oracle DB

sql oracle-database unique-constraint ora-00001
asked 2010-03-03T14:44:15.383
75
votes
5
answers

How can I create a SQL unique constraint based on 2 columns?

sql-server sql-server-2005 sql-server-2008 constraints unique-constraint
asked 2009-07-10T13:44:47.287