dropUniqueConstraint
Drops an existing unique constraint.
Available attributes
Name | Description | Required for | Supports | Since |
---|---|---|---|---|
catalogName
|
Name of the catalog |
all | 3.0 | |
constraintName
|
Name of the constraint |
all | all | |
schemaName
|
Name of the schema |
all | ||
tableName
|
Name of the table to drop the unique constraint from | all | all | |
uniqueColumns
|
For SAP SQL Anywhere, a list of columns in the UNIQUE clause |
sybase |
Examples
<databaseChangeLog
xmlns="http://www.liquibase.org/xml/ns/dbchangelog"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xmlns:ext="http://www.liquibase.org/xml/ns/dbchangelog-ext"
xmlns:pro="http://www.liquibase.org/xml/ns/pro"
xsi:schemaLocation="http://www.liquibase.org/xml/ns/dbchangelog
http://www.liquibase.org/xml/ns/dbchangelog/dbchangelog-latest.xsd
http://www.liquibase.org/xml/ns/dbchangelog-ext http://www.liquibase.org/xml/ns/dbchangelog/dbchangelog-ext.xsd
http://www.liquibase.org/xml/ns/pro http://www.liquibase.org/xml/ns/pro/liquibase-pro-latest.xsd">
<changeSet author="liquibase-docs" id="dropUniqueConstraint-example">
<dropUniqueConstraint catalogName="cat"
constraintName="const_name"
schemaName="public"
tableName="person"
uniqueColumns="name"/>
</changeSet>
</databaseChangeLog>
databaseChangeLog:
- changeSet:
id: dropUniqueConstraint-example
author: liquibase-docs
changes:
- dropUniqueConstraint:
catalogName: cat
constraintName: const_name
schemaName: public
tableName: person
uniqueColumns: name
{
"databaseChangeLog": [
{
"changeSet": {
"id": "dropUniqueConstraint-example",
"author": "liquibase-docs",
"changes": [
{
"dropUniqueConstraint": {
"catalogName": "cat",
"constraintName": "const_name",
"schemaName": "public",
"tableName": "person",
"uniqueColumns": "name"
}
}
]
}
}
]
}
--liquibase formatted sql
--changeset liquibase-docs:dropUniqueConstraint-example
ALTER TABLE cat.person DROP KEY const_name;
Database support
Database | Notes | Auto Rollback |
---|---|---|
DB2/LUW | Supported | No |
DB2/z | Supported | No |
Derby | Supported | No |
Firebird | Supported | No |
H2 | Supported | No |
HyperSQL | Supported | No |
INGRES | Supported | No |
Informix | Supported | No |
MariaDB | Supported | No |
MySQL | Supported | No |
Oracle | Supported | No |
PostgreSQL | Supported | No |
Snowflake | Supported | No |
SQL Server | Supported | No |
SQLite | Not Supported | No |
Sybase | Supported | No |
Sybase Anywhere | Supported | No |