Available in versions: Dev (3.21) | Latest (3.20) | 3.19 | 3.18 | 3.17 | 3.16 | 3.15 | 3.14 | 3.13 | 3.12 | 3.11
This documentation is for the unreleased development version of jOOQ. Click on the above version links to get this documentation for a supported version of jOOQ.
ALTER TABLE .. ADD UNIQUE
Applies to ✅ Open Source Edition ✅ Express Edition ✅ Professional Edition ✅ Enterprise Edition
All constraint types can be added with the ALTER TABLE statement. This includes UNIQUE constraints:
// Adding an unnamed constraint to a table
create.alterTable("table").add(unique("user_name")).execute();
// Adding a named constraint to a table
create.alterTable("table").add(constraint("uk").unique("user_name")).execute();
It is recommended to always provide a name with a constraint to simplify schema management. See also this section of the manual
Dialect support
This example using jOOQ:
alterTable("t").add(constraint("uk").unique("user_name"))
Translates to the following dialect specific expressions:
ASE, Access, Aurora MySQL, Aurora Postgres, BigQuery, ClickHouse, CockroachDB, DB2, Databricks, Derby, Exasol, Firebird, H2, HSQLDB, Hana, MariaDB, MemSQL, MySQL, Oracle, Postgres, Redshift, SQLServer, Snowflake, Sybase, Teradata, Vertica, YugabyteDB
ALTER TABLE t ADD CONSTRAINT uk UNIQUE (user_name)
Informix
ALTER TABLE t ADD CONSTRAINT UNIQUE (user_name) CONSTRAINT uk
SQLDataWarehouse
ALTER TABLE t ADD CONSTRAINT uk UNIQUE (user_name) NOT ENFORCED
DuckDB, SQLite, Trino
/* UNSUPPORTED */
Generated with jOOQ 3.21. Support in older jOOQ versions may differ. Translate your own SQL on our website
Feedback
Do you have any feedback about this page? We'd love to hear it!