asked on 12/28/2014

MS SQL DROP DEFAULT CONSTRAINT

I noticed, from the object sys.default_constraints, that MS SQL generates individual default constraints for each field set with a default value.
Please, note that I set the default values with one Alter table table1 add constraint tableconstr1 default ... for ...., and this statement was built using information from information_schema.columns.
Is there a way to drop all the default constraints generated automatically by MS SQL with one statement like
ALTER table table1 DROP CONSTRAINT tableconstr1 (name previously used in the statement above).

Thanks in advance for your time.

Microsoft SQL Server Microsoft SQL Server 2008

Last Comment

Vikas Garg

12/29/2014

Anthony Perkins

12/28/2014

Is there a way to drop all the default constraints generated automatically by MS SQL with one statement
As the syntax for ALTER TABLE shows you can drop as many constraints as you like with one statement.

Omer-Pitou

12/29/2014

ASKER

@Portlet Paul,
Since the link that was providing an answer to my question is deleted, how can I recover it.

ASKER CERTIFIED SOLUTION

Ali HND

12/29/2014

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Vikas Garg

12/29/2014

Hi,

You try the following

DECLARE @sql NVARCHAR(MAX) = N'';

SELECT @sql += N'
ALTER TABLE ' + QUOTENAME(OBJECT_SCHEMA_NAME(parent_object_id))
    + '.' + QUOTENAME(OBJECT_NAME(parent_object_id)) + 
    ' DROP CONSTRAINT ' + QUOTENAME(name) + ';'
FROM sys.foreign_keys;

--PRINT @sql;
EXEC sp_executesql @sql;

Open in new window

Or can try this as well

http://www.source-code.biz/snippets/mssql/2.htm

Hope this would help