DROP DEFAULT (Transact-SQL)
Updated: October 28, 2015
THIS TOPIC APPLIES TO:SQL Server Azure SQL Database Azure SQL Data Warehouse Parallel Data Warehouse
Removes one or more user-defined defaults from the current database.
DROP DEFAULT will be removed in the next version of Microsoft SQL Server. Do not use DROP DEFAULT in new development work, and plan to modify applications that currently use them. Instead, use default definitions that you can create by using the DEFAULT keyword of ALTER TABLE or CREATE TABLE.
- IF EXISTS
Applies to: SQL Server (SQL Server 2016 Community Technology Preview 3.2 (CTP 3.2) through current version).
Conditionally drops the default only if it already exists.
Is the name of the schema to which the default belongs.
Is the name of an existing default. To see a list of defaults that exist, execute sp_help. Defaults must comply with the rules for identifiers. Specifying the default schema name is optional.
Before dropping a default, unbind the default by executing sp_unbindefault if the default is currently bound to a column or an alias data type.
After a default is dropped from a column that allows for null values, NULL is inserted in that position when rows are added and no value is explicitly supplied. After a default is dropped from a NOT NULL column, an error message is returned when rows are added and no value is explicitly supplied. These rows are added later as part of the typical INSERT statement behavior.
To execute DROP DEFAULT, at a minimum, a user must have ALTER permission on the schema to which the default belongs.
If a default has not been bound to a column or to an alias data type, it can just be dropped using DROP DEFAULT. The following example removes the user-created default named datedflt.
USE AdventureWorks2012; GO IF EXISTS (SELECT name FROM sys.objects WHERE name = 'datedflt' AND type = 'D') DROP DEFAULT datedflt; GO
Beginning with SQL Server 2016 Community Technology Preview 3.2 (CTP 3.2) you can use the following syntax.
DROP DEFAULT IF EXISTS datedflt; GO
The following example unbinds the default associated with the EmergencyContactPhone column of the Contact table and then drops the default named phonedflt.
USE AdventureWorks2012; GO BEGIN EXEC sp_unbindefault 'Person.Contact.Phone' DROP DEFAULT phonedflt END; GO