要求
1）查询所有时间内，所有产品销售金额占比，按占比大小降序排序，筛选累计占比在前80%的产品，结果输出排名产品名称销售金额占比累计占比。
2）查询所有时间内，各个国家的销售情况，销售合计金额大于10000视为业绩合格,
否则为不合格，结果输出国家销售金额业绩情况。
3）查询中国、英国每个月份的销售情况，2020年8月份销售合计金额大于10000视为业绩合格，否则为不合格，2020年9月份销售合计金额大于12000视为业绩合格，否则为不合格，结果输出月份中国销售业绩、英国销售业绩。
实现代码
1）
SELECT a.productID 产品ID,(a.sale_amount * b.price) 销售金额,CONCAT((a.sale_amount * b.price / (select SUM(aa.sale_amount * bb.price) m from 2002a aa left join 2002b bb on aa.productID = bb.productID)) * 100,"%") percent FROM (select @rownum:=0) r,2002a a,2002b b WHERE (@rownum:=@rownum+1)<=(select round(count(distinct a.productid)*0.8) from 2002a a, 2002b b where a.productID = b.productID) AND a.productID = b.productID GROUP BY a.productID ORDER BY (a.sale_amount * b.price) DESC;
2）
SELECT country 国家,SUM(price*sale_amount) 销售金额,if(SUM(price*sale_amount)>10000,'合格','不合格') 业绩情况 FROM 2002a a,2002b b,2002c c WHERE a.productID=b.productID AND a.customID=c.customID GROUP BY country;
3）
SELECT date_format(zTime,'%Y-%m') 月份,SUM(price*sale_amount) 销售金额, if((date_format(zTime,'%Y-%m')='2020-08' AND SUM(price*sale_amount)>10000) OR (date_format(zTime,'%Y-%m')='2020-09' AND SUM(price*sale_amount)>13000) AND country='中国','合格','不合格') 中国销售业绩, if((date_format(zTime,'%Y-%m')='2020-08' OR SUM(price*sale_amount)>10000) AND (date_format(zTime,'%Y-%m')='2020-09' AND SUM(price*sale_amount)>13000) AND country='英国','合格','不合格') 英国销售业绩 FROM 2002a a,2002b b,2002c c WHERE a.productID=b.productID AND a.customID=c.customID AND country IN('中国','英国') AND (date_format(zTime,'%Y-%m')='2020-09' OR date_format(zTime,'%Y-%m')='2020-08') GROUP BY date_format(zTime,'%Y-%m');
实现查询结果显示前百分之八十的方法：
实现百分比显示：
首先认识两个函数concat()和left()、TRUNCATE(A,B)
CONCAT(str1,str2,...)拼接字符串，返回来自于参数连结的字符串。如果任何参数是NULL， 返回NULL。可以拼接多个。
LEFT(str,length)从左开始截取字符串.说明：left(被截取字段，截取长度)
TRUNCATE(A,B)返回被舍去至小数点后B位的数字A。若B的值为0,则结果不带有小数点或不带有小数部分。可以将B设为负数,若要截去(归零)A小数点左起第B位开始后面所有低位的值.，所有数字的舍入方向都接近于零
结合一下（我上面的代码没使用left）：concat ( left (数值1 / 数值2 *100,5),'%') as 投诉率
示例：
SELECT id,CONCAT(TRUNCATE(passScore / (danScore+panScore+duoScore) *100,2),'%') as 成绩与总分比 FROM aqsc_kaoshi_record;
实现mysql查询前百分之几的数据（这里是80％）
mysql不支持top和rowid，使用limit的方式也行不通。所以使用下面这种方式：
SELECT a.* FROM (SELECT @rownum:=0) r,2002a a WHERE (@rownum:=@rownum+1)<=(select round(count(*)*0.8) from 2002a);
这里的rownum只是个变量名，也可以是用其他的
将student表的grade从大到小排序后的前20%案例：
SELECT @rownum:=@rownum+1,student.* FROM (select @rownum:=0) row ,(select * from student order by student.grade desc) student ##排序 WHERE @rownum<(select round(count(*)/4) from student)
除了if外实现判断显示的示例：
select sum(case when sex = '男' then 1 else 0 end) /* 这是求男生人数 */ sum(case when sex = '女' then 1 else 0 end) /* 这是求女生人数 */ from student
数据库
以下是数据库完整代码：
/* Navicat MySQL Data Transfer Source Server : First Source Server Version : 80011 Source Host : localhost:3306 Source Database : fr_test_sql Target Server Type : MYSQL Target Server Version : 80011 File Encoding : 65001 Date: 2021-12-18 16:06:19 */ SET FOREIGN_KEY_CHECKS=0; -- ---------------------------- -- Table structure for `2002a` -- ---------------------------- DROP TABLE IF EXISTS `2002a`; CREATE TABLE `2002a` ( `orderID` varchar(255) NOT NULL, `zTime` date NOT NULL, `productID` varchar(255) NOT NULL, `sale_amount` int(11) NOT NULL, `customID` varchar(255) NOT NULL, PRIMARY KEY (`orderID`) ) ENGINE=InnoDB DEFAULT CHARSET=utf8; -- ---------------------------- -- Records of 2002a -- ---------------------------- INSERT INTO `2002a` VALUES ('O001', '2020-09-10', 'P010', '96', 'C008'); INSERT INTO `2002a` VALUES ('O002', '2020-08-29', 'P008', '38', 'C007'); INSERT INTO `2002a` VALUES ('O003', '2020-08-10', 'P007', '97', 'C008'); INSERT INTO `2002a` VALUES ('O004', '2020-09-27', 'P005', '62', 'C006'); INSERT INTO `2002a` VALUES ('O005', '2020-08-17', 'P007', '37', 'C009'); INSERT INTO `2002a` VALUES ('O006', '2020-09-06', 'P006', '3', 'C005'); INSERT INTO `2002a` VALUES ('O007', '2020-08-30', 'P009', '86', 'C007'); INSERT INTO `2002a` VALUES ('O008', '2020-09-04', 'P001', '34', 'C007'); INSERT INTO `2002a` VALUES ('O009', '2020-09-09', 'P003', '99', 'C004'); INSERT INTO `2002a` VALUES ('O010', '2020-09-06', 'P002', '65', 'C010'); INSERT INTO `2002a` VALUES ('O011', '2020-08-08', 'P005', '11', 'C002'); INSERT INTO `2002a` VALUES ('O012', '2020-09-20', 'P002', '3', 'C008'); INSERT INTO `2002a` VALUES ('O013', '2020-08-15', 'P004', '9', 'C004'); INSERT INTO `2002a` VALUES ('O014', '2020-08-28', 'P007', '99', 'C010'); INSERT INTO `2002a` VALUES ('O015', '2020-08-23', 'P003', '3', 'C005'); INSERT INTO `2002a` VALUES ('O016', '2020-08-08', 'P006', '51', 'C008'); INSERT INTO `2002a` VALUES ('O017', '2020-09-04', 'P009', '99', 'C002'); INSERT INTO `2002a` VALUES ('O018', '2020-08-12', 'P007', '86', 'C003'); INSERT INTO `2002a` VALUES ('O019', '2020-09-22', 'P001', '73', 'C005'); INSERT INTO `2002a` VALUES ('O020', '2020-08-03', 'P009', '22', 'C006'); INSERT INTO `2002a` VALUES ('O021', '2020-08-22', 'P007', '54', 'C006'); INSERT INTO `2002a` VALUES ('O022', '2020-09-29', 'P005', '59', 'C005'); INSERT INTO `2002a` VALUES ('O023', '2020-08-15', 'P003', '45', 'C006'); INSERT INTO `2002a` VALUES ('O024', '2020-09-12', 'P001', '10', 'C004'); INSERT INTO `2002a` VALUES ('O025', '2020-08-23', 'P004', '56', 'C008'); INSERT INTO `2002a` VALUES ('O026', '2020-09-17', 'P003', '57', 'C004'); INSERT INTO `2002a` VALUES ('O027', '2020-08-23', 'P002', '73', 'C003'); INSERT INTO `2002a` VALUES ('O028', '2020-09-22', 'P003', '50', 'C008'); INSERT INTO `2002a` VALUES ('O029', '2020-09-22', 'P003', '70', 'C007'); INSERT INTO `2002a` VALUES ('O030', '2020-08-13', 'P006', '15', 'C002'); -- ---------------------------- -- Table structure for `2002b` -- ---------------------------- DROP TABLE IF EXISTS `2002b`; CREATE TABLE `2002b` ( `productID` varchar(255) CHARACTER SET utf8 COLLATE utf8_general_ci NOT NULL, `productName` varchar(255) CHARACTER SET utf8 COLLATE utf8_general_ci NOT NULL, `price` decimal(10,0) NOT NULL, PRIMARY KEY (`productID`) ) ENGINE=InnoDB DEFAULT CHARSET=utf8; -- ---------------------------- -- Records of 2002b -- ---------------------------- INSERT INTO `2002b` VALUES ('P001', '产品A', '29'); INSERT INTO `2002b` VALUES ('P002', '产品B', '50'); INSERT INTO `2002b` VALUES ('P003', '产品C', '42'); INSERT INTO `2002b` VALUES ('P004', '产品D', '59'); INSERT INTO `2002b` VALUES ('P005', '产品E', '49'); INSERT INTO `2002b` VALUES ('P006', '产品F', '10'); INSERT INTO `2002b` VALUES ('P007', '产品G', '23'); INSERT INTO `2002b` VALUES ('P008', '产品H', '24'); INSERT INTO `2002b` VALUES ('P009', '产品I', '50'); INSERT INTO `2002b` VALUES ('P010', '产品J', '64'); -- ---------------------------- -- Table structure for `2002c` -- ---------------------------- DROP TABLE IF EXISTS `2002c`; CREATE TABLE `2002c` ( `customID` varchar(255) CHARACTER SET utf8 COLLATE utf8_general_ci NOT NULL, `customName` varchar(255) NOT NULL, `country` varchar(255) NOT NULL, PRIMARY KEY (`customID`) ) ENGINE=InnoDB DEFAULT CHARSET=utf8; -- ---------------------------- -- Records of 2002c -- ---------------------------- INSERT INTO `2002c` VALUES ('C001', '客户A', '中国'); INSERT INTO `2002c` VALUES ('C002', '客户B', '法国'); INSERT INTO `2002c` VALUES ('C003', '客户C', '中国'); INSERT INTO `2002c` VALUES ('C004', '客户D', '英国'); INSERT INTO `2002c` VALUES ('C005', '客户E', '美国'); INSERT INTO `2002c` VALUES ('C006', '客户F', '中国'); INSERT INTO `2002c` VALUES ('C007', '客户G', '法国'); INSERT INTO `2002c` VALUES ('C008', '客户H', '英国'); INSERT INTO `2002c` VALUES ('C009', '客户I', '美国'); INSERT INTO `2002c` VALUES ('C010', '客户H', '英国'); -- ---------------------------- -- Table structure for `2003_a` -- ---------------------------- DROP TABLE IF EXISTS `2003_a`; CREATE TABLE `2003_a` ( `CLASSNO` varchar(255) DEFAULT NULL, `STUDENTNO` varchar(255) DEFAULT NULL, `GRADE` varchar(255) DEFAULT NULL ) ENGINE=InnoDB DEFAULT CHARSET=utf8; -- ---------------------------- -- Records of 2003_a -- ---------------------------- INSERT INTO `2003_a` VALUES ('CLASS1', '1001', '86'); INSERT INTO `2003_a` VALUES ('CLASS1', '1002', '60'); INSERT INTO `2003_a` VALUES ('CLASS1', '1003', '85'); INSERT INTO `2003_a` VALUES ('CLASS1', '1004', '73'); INSERT INTO `2003_a` VALUES ('CLASS1', '1005', '95'); INSERT INTO `2003_a` VALUES ('CLASS1', '1006', '61'); INSERT INTO `2003_a` VALUES ('CLASS1', '1007', '77'); INSERT INTO `2003_a` VALUES ('CLASS1', '1008', '71'); INSERT INTO `2003_a` VALUES ('CLASS1', '1009', '61'); INSERT INTO `2003_a` VALUES ('CLASS1', '1010', '78'); INSERT INTO `2003_a` VALUES ('CLASS2', '2001', '81'); INSERT INTO `2003_a` VALUES ('CLASS2', '2002', '54'); INSERT INTO `2003_a` VALUES ('CLASS2', '2003', '57'); INSERT INTO `2003_a` VALUES ('CLASS2', '2004', '75'); INSERT INTO `2003_a` VALUES ('CLASS2', '2005', '98'); INSERT INTO `2003_a` VALUES ('CLASS2', '2006', '75'); INSERT INTO `2003_a` VALUES ('CLASS2', '2007', '76'); INSERT INTO `2003_a` VALUES ('CLASS2', '2008', '58'); INSERT INTO `2003_a` VALUES ('CLASS2', '2009', '73'); INSERT INTO `2003_a` VALUES ('CLASS2', '2010', '55'); INSERT INTO `2003_a` VALUES ('CLASS3', '3001', '42'); INSERT INTO `2003_a` VALUES ('CLASS3', '3002', '90'); INSERT INTO `2003_a` VALUES ('CLASS3', '3003', '81'); INSERT INTO `2003_a` VALUES ('CLASS3', '3004', '97'); INSERT INTO `2003_a` VALUES ('CLASS3', '3005', '68'); INSERT INTO `2003_a` VALUES ('CLASS3', '3006', '72'); INSERT INTO `2003_a` VALUES ('CLASS3', '3007', '81'); INSERT INTO `2003_a` VALUES ('CLASS3', '3008', '79'); INSERT INTO `2003_a` VALUES ('CLASS3', '3009', '87'); INSERT INTO `2003_a` VALUES ('CLASS3', '3010', '59'); -- ---------------------------- -- Table structure for `2004_a` -- ---------------------------- DROP TABLE IF EXISTS `2004_a`; CREATE TABLE `2004_a` ( `TYEAR` varchar(255) DEFAULT NULL, `TMONTH` varchar(255) DEFAULT NULL, `SALE_MONEY` varchar(255) DEFAULT NULL ) ENGINE=InnoDB DEFAULT CHARSET=utf8; -- ---------------------------- -- Records of 2004_a -- ---------------------------- INSERT INTO `2004_a` VALUES ('2019', '10', '1279'); INSERT INTO `2004_a` VALUES ('2019', '11', '2316'); INSERT INTO `2004_a` VALUES ('2019', '12', '2090'); INSERT INTO `2004_a` VALUES ('2020', '01', '1086'); INSERT INTO `2004_a` VALUES ('2020', '02', '2046'); INSERT INTO `2004_a` VALUES ('2020', '03', '0'); INSERT INTO `2004_a` VALUES ('2020', '04', '2959'); INSERT INTO `2004_a` VALUES ('2020', '05', '1314'); INSERT INTO `2004_a` VALUES ('2020', '06', '2751'); INSERT INTO `2004_a` VALUES ('2020', '07', '1492'); INSERT INTO `2004_a` VALUES ('2020', '08', '1414'); INSERT INTO `2004_a` VALUES ('2020', '09', '2895'); INSERT INTO `2004_a` VALUES ('2020', '10', '2999'); INSERT INTO `2004_a` VALUES ('2020', '11', '1982'); INSERT INTO `2004_a` VALUES ('2020', '12', '2793'); INSERT INTO `2004_a` VALUES ('2021', '01', '2156'); INSERT INTO `2004_a` VALUES ('2021', '02', '1733'); INSERT INTO `2004_a` VALUES ('2021', '03', '2184'); -- ---------------------------- -- Table structure for `t_user` -- ---------------------------- DROP TABLE IF EXISTS `t_user`; CREATE TABLE `t_user` ( `user_id` int(11) NOT NULL AUTO_INCREMENT COMMENT '编号', `user_access` varchar(20) NOT NULL DEFAULT '' COMMENT '账号', `user_token` varchar(20) NOT NULL DEFAULT '123456' COMMENT '密码', `user_nick` varchar(20) NOT NULL DEFAULT '虾米' COMMENT '昵称', `user_gender` bit(1) NOT NULL DEFAULT b'1' COMMENT '1为男，0为女', `user_hobbies` varchar(20) NOT NULL COMMENT '爱好', `user_type` int(1) NOT NULL DEFAULT '1' COMMENT '类型', PRIMARY KEY (`user_id`), UNIQUE KEY `uk_user_access` (`user_access`) USING BTREE ) ENGINE=InnoDB AUTO_INCREMENT=7 DEFAULT CHARSET=utf8; -- ---------------------------- -- Records of t_user -- ---------------------------- INSERT INTO `t_user` VALUES ('1', 'cqswxy', '111111', '重庆商务', '', '编程,游戏', '3'); INSERT INTO `t_user` VALUES ('2', 'zjczjc', '222222', '俊采星驰', '', '编程,学习', '2'); INSERT INTO `t_user` VALUES ('3', 'cetoox', '333333', '光速为零', '', '游戏,学习', '1'); INSERT INTO `t_user` VALUES ('4', 'XXX', '23', 'XXX', '', 'XXXX', '1'); INSERT INTO `t_user` VALUES ('6', 'dasda', '123456', '虾米', '', 'asd', '5'); -- ---------------------------- -- Table structure for `t_user_type` -- ---------------------------- DROP TABLE IF EXISTS `t_user_type`; CREATE TABLE `t_user_type` ( `user_type_id` int(11) NOT NULL AUTO_INCREMENT, `user_type_name` varchar(2) NOT NULL, PRIMARY KEY (`user_type_id`) ) ENGINE=InnoDB AUTO_INCREMENT=5 DEFAULT CHARSET=utf8; -- ---------------------------- -- Records of t_user_type -- ---------------------------- INSERT INTO `t_user_type` VALUES ('1', '菜鸟'); INSERT INTO `t_user_type` VALUES ('2', '高手'); INSERT INTO `t_user_type` VALUES ('3', '传说'); INSERT INTO `t_user_type` VALUES ('4', '普通');
