示例：----------------------------------开始--------------------------------------------------------------------
ALTER TABLE p_channel ADD COLUMN totalChannelProfit  DECIMAL(12,2) DEFAULT 0 COMMENT '渠道总利润';
ALTER TABLE h_page_statistics ADD COLUMN isRead int default 0 COMMENT '是否阅读,0未，1是'; 
ALTER TABLE b_customer_roll_pic ADD COLUMN picCategory ENUM('ip','ic','pa','icbc','common') DEFAULT 'ip';
ALTER TABLE p_customer_info DROP  COLUMN customerContact;
ALTER TABLE biz_receiptvoucher modify COLUMN receiptType ENUM('sk','tk','zz','csrz','ptdsk','ptzz') DEFAULT 'sk';
示例：----------------------------------结束--------------------------------------------------------------------

ALTER TABLE c_app_product ADD COLUMN pushServiceItemCode VARCHAR(100) DEFAULT NULL COMMENT '推送到服务商的产品编码'; 
ALTER TABLE b_order ADD COLUMN needNoOrderNo VARCHAR(64) DEFAULT NULL COMMENT '需求订单号'; 
ALTER TABLE b_order_tm_product ADD COLUMN needNoOrderNo VARCHAR(64) DEFAULT NULL COMMENT '需求订单号'; 

ALTER TABLE b_order_tm_product modify COLUMN deliveryStatus ENUM('dqrfa','fabtg','dfwsfw','dsccl','dsh','ddj','ydj','ywc') DEFAULT 'dfwsfw';