mysql数据库select赋值

1、登录mysql中，在test数据库新建一个表：

CREATE TABLE `shoufei` (  `id` int(11) NOT NULL AUTO_INCREMENT,  `shijian` timestamp NOT NULL DEFAULT CURRENT_TIMESTAMP,  `xiangmu` varchar(20) NOT NULL,  `jiage` float NOT NULL,  `shuliang` int(11) NOT NULL,  `jine` float DEFAULT NULL,  PRIMARY KEY (`id`)) ENGINE=InnoDB AUTO_INCREMENT=6 DEFAULT CHARSET=utf8

2、在表中增加一些数据：

insert into `shoufei` (`id`, `shijian`, `xiangmu`, `jiage`, `shuliang`, `jine`) values('1','2019-01-28 11:15:52','银翘解毒丸','2','10','20');

insert into `shoufei` (`id`, `shijian`, `xiangmu`, `jiage`, `shuliang`, `jine`) values('2','2019-01-28 11:15:59','甘草片','20','2','30');

insert into `shoufei` (`id`, `shijian`, `xiangmu`, `jiage`, `shuliang`, `jine`) values('3','2019-01-28 11:16:04','阿莫西林','20','2','40');

insert into `shoufei` (`id`, `shijian`, `xiangmu`, `jiage`, `shuliang`, `jine`) values('4','2019-01-28 11:16:08','午时茶','8','1','8');

insert into `shoufei` (`id`, `shijian`, `xiangmu`, `jiage`, `shuliang`, `jine`) values('5','2019-01-28 11:16:12','银翘解毒丸','2','10','20');

3、把id=2的记录，xiangmu字段值赋值给@xm用户变量，并且显示@xm值；

SELECT xiangmu INTO @xm FROM shoufei WHERE id=2;

SELECT @xm;

4、把id=3的记录，xiangmu、jiage字段值赋值@xm、@jg,并且显示.

SELECT xiangmu ,jiage INTO @xm,@jg FROM shoufei WHERE id=3;

SELECT @xm,@jg;

5、把id=4的记录，计算出金额：

SELECT xiangmu ,jiage*shuliang INTO @xm,@je FROM shoufei WHERE id=4;

SELECT @xm,@je;

6、把id=5的记录，登记时间赋值给 @lr:

SELECT CONCAT(shijian,xiangmu) INTO @lr FROM shoufei WHERE id=5;

SELECT @lr;