Why does SQL Server keep creating a DF constraint?

Question

I\'m trying to create upgrade and backout scripts in SQL. The upgrade script adds a column like so:

IF NOT EXISTS (SELECT * FROM sys.columns WHERE Name = N\'Col         


        

Answer 1

Run this:

declare @name as nvarchar(255);
SELECT @name = name FROM dbo.sysobjects 
WHERE name LIKE 'DF__XXX__YYY__%' and type = 'D'

IF @name IS NOT NULL BEGIN
    EXEC('ALTER TABLE XXX DROP CONSTRAINT ' + @name);
END