dropDefaultValue

Removes the database default value for a column.

Run dropDefaultValue

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:
    4. liquibase update

Available attributes

Name Description Required for Supports Since
catalogName

Name of the catalog

 all 3.0
columnDataType

Data type of the column.

To help make scripts database-independent, Liquibase automatically converts the following generic data types to the correct database implementation: BIGINT, BLOB, BOOLEAN, CHAR, CLOB, CURRENCY, DATE, DATETIME, DECIMAL, DOUBLE, FLOAT, INT, MEDIUMINT, NCHAR, NUMBER, NVARCHAR, SMALLINT, TIME, TIMESTAMP, TINYINT, UUID, VARCHAR, XML.

Also, specifying a java.sql.Types.* type is converted to the correct type as well. For example:

  • java.sql.Types.TIMESTAMP
  • java.sql.Types.VARCHAR(255)

For Snowflake, Liquibase also implements BINARY, TIME, and TIMESTAMP_NTZ. For Databricks, Liquibase also implements ARRAY<INT> and ARRAY<STRING>.

Note: To specify a complex Databricks type like ARRAY<STRING> in an XML changelog, you must specify the escape sequences &lt; and &gt; rather than < and >. See createTable.

For more information, see Liquibase Data Type Handling.

 informix all
columnName Name of the column to drop the default value from all all
schemaName

Name of the schema

 all
tableName Name of the table containing the column to drop the default value from all all

Examples

--liquibase formatted sql

--changeset liquibase-docs:dropDefaultValue-example
ALTER  TABLE  cat.person  ALTER  id  DROP  DEFAULT;
databaseChangeLog:
-  changeSet:
    id:  dropDefaultValue-example
    author:  liquibase-docs
    changes:
    -  dropDefaultValue:
        catalogName:  cat
        columnDataType:  int
        columnName:  id
        schemaName:  public
        tableName:  person
{
    "databaseChangeLog": [
        {
            "changeSet": {
                "id": "dropDefaultValue-example",
                "author": "liquibase-docs",
                "changes": [
                    {
                        "dropDefaultValue": {
                            "catalogName": "cat",
                            "columnDataType": "int",
                            "columnName": "id",
                            "schemaName": "public",
                            "tableName": "person"
                        }
                    }
                ]
            }
        }
    ]
}
<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="dropDefaultValue-example">
        <dropDefaultValue  catalogName="cat"
            columnDataType="int"
            columnName="id"
            schemaName="public"
            tableName="person"/>
    </changeSet>

</databaseChangeLog>

Database support

Database Notes Auto Rollback
DB2/LUW Supported No
DB2/z Supported No
Derby Supported No
Firebird Supported No
Google BigQuery Not 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