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How to drop Constraints in SQL Server

Posted Date: 04 May 2008 Resource Type: Code Snippets Category: SQL

Posted By: @@@ Hyderabadi Biryani @@@ Member Level: Diamond
Rating:

Points: 15

The following code sample shows how to drop Constraints in SQL Server
declare @name nvarchar(32),
@sql nvarchar(1000)

-- find constraint name
select @name = O.name
from sysobjects AS O
left join sysobjects AS T
on O.parent_obj = T.id
where isnull(objectproperty(O.id,'IsMSShipped'),1) = 0
and O.name not like '%dtproper%'
and O.name not like 'dt[_]%'
and T.name = 'MyTable'
and O.name like 'DF__MyTable__MyColu%'

-- delete if found
if not @name is null
begin
select @sql = 'ALTER TABLE [MyTable] DROP CONSTRAINT [' + @name + ']'
execute sp_executesql @sql
end

-- do your ALTER TABLE here

-- replace the constraint
select @sql = 'ALTER TABLE [MyTable] ADD CONSTRAINT [' + @name + '] DEFAULT (0) FOR [MyColumn]'
execute sp_executesql @sql

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