addUniqueConstraint

Adds a unique constraint to an existing column or set of columns.

Run addUniqueConstraint

To run this Change Type, follow these steps:

  1. Add the Change Type to your changeset, as shown in the examples on this page.

  2. Specify any required attributes. Use the table on this page to see which ones your database requires.

  3. Deploy your changeset by running the update command:liquibase update

Available attributes

Name

Description

Required for

Supports

catalogName

Name of the catalog

all

clustered

Boolean. Whether to create a clustered index

mssql

columnNames

Name of the column(s) to create the unique constraint on. Comma separated if multiple

all

all

constraintName

Name of the constraint

all

deferrable

Defines whether constraints are deferrable

all

disabled

Boolean. Specifies whether the constraint is disabled.

all

forIndexCatalogName

Name of the catalog of the index to associate with the constraint

all

forIndexName

Name of the index to associate with the constraint

oracle

forIndexSchemaName

Name of the schema of the index to associate with the constraint

all

initiallyDeferred

Defines whether constraints are initially deferred

all

schemaName

Name of the schema

all

tableName

Name of the table to create the unique constraint on

all

all

tablespace

Name of the tablespace to use for the index

all

validate

Set to true if the constraint has ENABLE VALIDATE set, or false if the constraint has ENABLE NOVALIDATE set.

all

Database support

Database

Notes

Auto Rollback

DB2/LUW

Supported

Yes

DB2/z

Supported

Yes

Derby

Supported

Yes

Firebird

Supported

Yes

Google BigQuery

Supported

Yes

H2

Supported

Yes

HyperSQL

Supported

Yes

INGRES

Supported

Yes

Informix

Supported

Yes

MariaDB

Supported

Yes

MySQL

Supported

Yes

Oracle

Supported

Yes

PostgreSQL

Supported

Yes

Snowflake

Supported

Yes

SQL Server

Supported

Yes

SQLite

Not Supported

No

Sybase

Supported

Yes

Sybase Anywhere

Supported

Yes

addUniqueConstraint examples

--liquibase formatted sql
--changeset liquibase-docs:addUniqueConstraint-example
ALTER TABLE cat.person ADD CONSTRAINT const_name UNIQUE CLUSTERED (id, name) USING INDEX `A String`;

addUniqueConstraint - Liquibase