【转】sql添加字段并加备注、默认值

ALTER TABLE CRM_MarketBargain ADD MasterID int default 0  
GO  
EXEC sp_addextendedproperty 'MS_Description', @value=N'母合同ID(如果为0则为母合同，否则不是)' ,
@level0type=N'USER', @level0name=N'dbo', @level1type=N'TABLE', 
@level1name=N'CRM_MarketBargain', @level2type=N'COLUMN', @level2name=N'MasterID'