Change: ‘dropNotNullConstraint’
Makes a column nullable
Available Attributes
| Name | Description |
|---|---|
| catalogName | Name of the catalog@ v3.0E.g. 'cat' |
| columnDataType | Current data type of the columnE.g. 'int'Required for: informix, mariadb, mssql, mysql |
| columnName | Name of the column to drop the constraint fromE.g. 'id' |
| schemaName | Name of the schemaE.g. 'public' |
| tableName | Name of the table containing that the column to drop the constraint fromE.g. 'person' |
<changeSet author="liquibase-docs" id="dropNotNullConstraint-example">
<dropNotNullConstraint catalogName="cat"
columnDataType="int"
columnName="id"
schemaName="public"
tableName="person"/>
</changeSet>changeSet:
id: dropNotNullConstraint-example
author: liquibase-docs
changes:
- dropNotNullConstraint:
catalogName: cat
columnDataType: int
columnName: id
schemaName: public
tableName: person{
"changeSet": {
"id": "dropNotNullConstraint-example",
"author": "liquibase-docs",
"changes": [
{
"dropNotNullConstraint": {
"catalogName": "cat",
"columnDataType": "int",
"columnName": "id",
"schemaName": "public",
"tableName": "person"
}
}]
}
}SQL Generated From Above Sample (MySQL)
ALTER TABLE cat.person MODIFY id INT NULL;Database Support
| Database | Notes | Auto Rollback |
|---|---|---|
| DB2/LUW | Supported | Yes |
| DB2/z | Not Supported | Yes |
| Derby | Supported | Yes |
| Firebird | Not 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 |
| SQL Server | Supported | Yes |
| SQLite | Not Supported | Yes |
| Sybase | Supported | Yes |
| Sybase Anywhere | Supported | Yes |