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.
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Anthony PerkinsCommented:
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-PitouAuthor Commented:
@Portlet Paul,
Since  the link that was providing an answer to my question is deleted,  how can I recover it.
Ali HNDCommented:
to drop default constraint that you don't knowing its name:
declare @table_name nvarchar(256)
declare @col_name nvarchar(256)
set @table_name = N’Department’
set @col_name = N’ModifiedDate’

select,,, d.definition
from sys.tables t
    sys.default_constraints d
        on d.parent_object_id = t.object_id
    sys.columns c
        on c.object_id = t.object_id
        and c.column_id = d.parent_column_id
where = @table_name
and = @col_name

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you can also refer to this link:

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Vikas GargAssociate Principal EngineerCommented:

You try the following


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

--PRINT @sql;
EXEC sp_executesql @sql;

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Or can try this as well

Hope this would help
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Microsoft SQL Server

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