MySQL嵌套查询实例（2）

问题：

存在如下2张表，数据一次如下，goods(商品表），orders(销售订单表），假定一个订单只能购买一种商品。

左边为goods（商品表），右边为orders(销售订单表）。

要求：用MySQL语句实现，查出2017年2月份，商品月销售总额大于10000元，金额排名前三的商品名称以及金额。

首先创建表，

①商品表的创建
DROP TABLE IF EXISTS `goods`;
CREATE TABLE `goods` (
`id` int(10) unsigned NOT NULL AUTO_INCREMENT,
  `name` varchar(64) NOT NULL,
  `price` decimal(10,2) NOT NULL,
  PRIMARY KEY (`id`)
) ENGINE=MyISAM  DEFAULT CHARSET=utf8 COMMENT='商品表';
插入一些测试数据，
INSERT INTO `goods` VALUES ('1', '笔记本', '5000.00');
INSERT INTO `goods` VALUES ('2', '手机', '2000.00');
INSERT INTO `goods` VALUES ('3', '平板电脑', '3000.00');
INSERT INTO `goods` VALUES ('4', '单反相机', '10000.00');
INSERT INTO `goods` VALUES ('5', '投影仪', '6000.00');
②订单表的创建
DROP TABLE IF EXISTS `orders`;
CREATE TABLE `orders` (
`id` int(10) unsigned NOT NULL AUTO_INCREMENT,
  `gid` int(10) unsigned NOT NULL COMMENT '商品ID',
  `num` int(10) unsigned NOT NULL COMMENT '订单数量',
  `create_time` int(10) unsigned NOT NULL COMMENT '订单时间',
  PRIMARY KEY (`id`)
) ENGINE=MyISAM  DEFAULT CHARSET=latin1 COMMENT='订单表';
同样插入一些测试数据，

INSERT INTO `orders` VALUES ('1', '2', '1', '1486224001');
INSERT INTO `orders` VALUES ('2', '1', '1', '1483545600');
INSERT INTO `orders` VALUES ('3', '2', '1', '1486224002');
INSERT INTO `orders` VALUES ('4', '3', '2', '1486224003');
INSERT INTO `orders` VALUES ('5', '3', '2', '1486224004');
INSERT INTO `orders` VALUES ('6', '3', '3', '1483545600');
INSERT INTO `orders` VALUES ('7', '1', '3', '1486224005');
INSERT INTO `orders` VALUES ('8', '2', '4', '1483545600');
INSERT INTO `orders` VALUES ('9', '1', '1', '1486224006');
INSERT INTO `orders` VALUES ('10', '1', '4', '1486224007');
INSERT INTO `orders` VALUES ('11', '2', '2', '1483545600');
INSERT INTO `orders` VALUES ('12', '3', '3', '1486224008');
INSERT INTO `orders` VALUES ('13', '3', '1', '1483545600');
INSERT INTO `orders` VALUES ('14', '2', '1', '1486224009');
INSERT INTO `orders` VALUES ('15', '2', '3', '1483545600');
INSERT INTO `orders` VALUES ('16', '2', '2', '1486224010');
INSERT INTO `orders` VALUES ('17', '2', '1', '1483545600');
INSERT INTO `orders` VALUES ('18', '1', '1', '1486224011');
INSERT INTO `orders` VALUES ('19', '1', '2', '1486224012');
INSERT INTO `orders` VALUES ('20', '3', '1', '1486224013');
INSERT INTO `orders` VALUES ('21', '1', '1', '1486224014');
INSERT INTO `orders` VALUES ('22', '5', '1', '1486224015');
INSERT INTO `orders` VALUES ('23', '5', '1', '1486224016');
INSERT INTO `orders` VALUES ('24', '4', '2', '1486224017');
INSERT INTO `orders` VALUES ('25', '5', '1', '1486224018');
INSERT INTO `orders` VALUES ('26', '5', '2', '1486224019');

然后分布进行查询：

第一步：先查询出2017年2月份的订单，SQL语句如下

SELECT g.*,o.num,o.create_time FROM orders o LEFT JOIN goods g ON o.gid=g.id

WHERE FROM_UNIXTIME(create_time,'%Y-%m')='2017-02';

查询部分结果如图，

第二步：查询2月份每种商品的销售数量，销售总额

SELECT t.id,t.name,t.price,sum(t.num)as total,sum(t.num)*t.price as total_price FROM(
    SELECT g.*,o.num,o.create_time FROM orders o LEFT JOIN goods g ON o.gid=g.id 
WHERE FROM_UNIXTIME(create_time,'%Y-%m')='2017-02')as t  GROUP BY t.id;

查询结果见下图，

最后：查询出销售总额大于10000元，金额排名前三的商品名称以及金额

SELECT tt.name,tt.total_price FROM(
SELECT t.id,t.name,t.price,sum(t.num)as total,sum(t.num)*t.price as total_price FROM(
SELECT g.*,o.num,o.create_time FROM orders o LEFT JOIN goods g ON o.gid=g.id 
WHERE FROM_UNIXTIME(create_time,'%Y-%m')='2017-02')as t  GROUP BY t.id)as tt 
WHERE tt.total_price>10000 ORDER BY tt.total_price DESC LIMIT 3;

结果如下图，

本文为作者原创，转载请备注来源，谢谢合作！

MySQL嵌套查询实例（2）

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