====== Drop Not-Null Constraint ======

Makes a column nullable.

===== Sample =====

<code xml>
<dropNotNullConstraint tableName="employee" columnName="employer_id"/>
</code>

===== Available Attributes =====

^ tableName  | Name of the table containing that the column to drop the constraint from **[required]**  | 
^ schemaName  | Name of the table schema  | 
^ columnName  | Name of the column to drop the constraint from **[required]**  | 
^ columnDataType  | Current data type of the column [required for MySQL & MS-SQL]  | 

===== Database Compatiblity =====

^ MySQL  | No Issues  | 
^ PostgreSQL  | No Issues  | 
^ Oracle  | No Issues  | 
^ MS-SQL  | No Issues  |
^ Sybase  | No Issues  | 
^ DB2  | No Issues  | 
^ Derby  | No Issues  | 
^ HSQL  | No Issues  | 
^ H2  | No Issues  | 
^ Caché  | No Issues  | 
^ Firebird  | Not Supported  | 
^ MaxDB  | No Issues  | 

Automatic Rollback Support: **YES**