declare @default sysname, @sql nvarchar(max)
BEGIN
??? IF? EXISTS(SELECT 1 FROM SYSCOLUMNS A,SYSOBJECTS B
????? WHERE A.id=B.id AND B.name='TableName' AND B.xtype='u' AND A.name='ColumnName')
??????????? BEGIN
????????????????? SELECT @default = name
????????????????? from sys.default_constraints
????????????????? WHERE parent_object_id = object_id(' TableName ')
????????????????? AND type = 'D'
????????????????? AND parent_column_id = (
??????????????????????? select column_id
??????????????????????? from sys.columns
??????????????????????? where object_id = object_id(' TableName ')
??????????????????????? and name = 'Accounts'
??????????????????????? )
?
????????????????? set @sql = N'alter table [ TableName ] ? drop constraint ' + @default
????????????????? exec sp_executesql @sql
?
????????????????? alter table [ TableName ] drop column [ ColumnName ]
??????????? END
END
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