优化表的数据类型

select * from tbl_name procedure analyse();

select * from tbl_name procedure analyse(16,256);

创建客户每天的消费记录：

Create Table: CREATE TABLE `session` (
`cust_id` varchar(10) DEFAULT NULL,
`cust_amount` decimal(16,2) DEFAULT NULL,
`cust_date` date DEFAULT NULL,
`cust_ip` varchar(20) DEFAULT NULL
) ENGINE=InnoDB DEFAULT CHARSET=utf8;

最近一周客户消费的总金额和近一周不同时段用户的消费总金额

select sum(cust_amount) from session where cust_date>adddate(now(),-7);

创建中间临时表

Create Table: CREATE TABLE `tmp_session` (
`cust_id` varchar(10) DEFAULT NULL,
`cust_amount` decimal(16,2) DEFAULT NULL,
`cust_date` date DEFAULT NULL,
`cust_ip` varchar(20) DEFAULT NULL
) ENGINE=InnoDB DEFAULT CHARSET=utf8

insert into session values(3,300,'2013-1-7','192.168.1.1');