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 if you want remove constraint:

DECLARE @tableName NVARCHAR(255) = '[INSERT]';
DECLARE @first5CharsFromColumnName NVARCHAR(255) = '[INSERT]';
DECLARE @name NVARCHAR(255);
SELECT @name = d.name FROM dbo.sysobjects d
INNER JOIN dbo.sysobjects t ON t.id = d.parent_obj
WHERE d.name LIKE '%'+@first5CharsFromColumnName+'%' AND d.type = 'D' AND t.name = @tableName

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