标签：creat create 间隔 form 统计 set 查看 获取 out
MySQL按周统计每周数据总和，用到了WEEK，subdate，date_format，date_sub，date_add函数。
WEEK() 查看给定日期周数，语法：WEEK(date, mode);
SUBDATE() 函数做日期减法操作，语法：SUBDATE(date,INTERVAL expr unit) 和 SUBDATE(expr,days);
DATE_FORMAT() 函数用于以不同的格式显示日期/时间数据，语法：DATE_FORMAT(date,format);
DATE_SUB() 函数从日期减去指定的时间间隔，语法：DATE_SUB(date,INTERVAL expr type);
DATE_ADD() 函数向日期添加指定的时间间，语法：DATE_ADD(date,INTERVAL expr type);
样例数据：
-- 创建数据样例表 CREATE TABLE `day_weight_tb` ( `day_date` varchar(16) DEFAULT NULL, `in_weight` varchar(64) DEFAULT NULL, `out_weight` varchar(64) DEFAULT NULL ) ENGINE=InnoDB DEFAULT CHARSET=utf8; -- 插入样例数据 INSERT INTO `day_weight_tb` (`day_date`, `in_weight`, `out_weight`) VALUES (‘2018-03-10‘, ‘18.84‘, ‘74.14‘); INSERT INTO `day_weight_tb` (`day_date`, `in_weight`, `out_weight`) VALUES (‘2019-01-21‘, ‘17.69‘, ‘25.97‘); INSERT INTO `day_weight_tb` (`day_date`, `in_weight`, `out_weight`) VALUES (‘2019-02-01‘, ‘16.48‘, ‘10.0‘); INSERT INTO `day_weight_tb` (`day_date`, `in_weight`, `out_weight`) VALUES (‘2019-01-29‘, ‘10.9‘, ‘74.12‘); INSERT INTO `day_weight_tb` (`day_date`, `in_weight`, `out_weight`) VALUES (‘2019-02-13‘, ‘15.25‘, ‘16.62‘); INSERT INTO `day_weight_tb` (`day_date`, `in_weight`, `out_weight`) VALUES (‘2019-01-12‘, ‘19.21‘, ‘95.42‘); INSERT INTO `day_weight_tb` (`day_date`, `in_weight`, `out_weight`) VALUES (‘2019-02-14‘, ‘26.38‘, ‘20.59‘); INSERT INTO `day_weight_tb` (`day_date`, `in_weight`, `out_weight`) VALUES (‘2019-01-24‘, ‘15.99‘, ‘16.823‘); INSERT INTO `day_weight_tb` (`day_date`, `in_weight`, `out_weight`) VALUES (‘2019-01-13‘, ‘94.846‘, ‘56.256‘); INSERT INTO `day_weight_tb` (`day_date`, `in_weight`, `out_weight`) VALUES (‘2019-03-03‘, ‘15.63‘, ‘12.128‘); INSERT INTO `day_weight_tb` (`day_date`, `in_weight`, `out_weight`) VALUES (‘2019-03-12‘, ‘14.282‘, ‘24.046‘); INSERT INTO `day_weight_tb` (`day_date`, `in_weight`, `out_weight`) VALUES (‘2019-01-16‘, ‘14.045‘, ‘11.73‘); INSERT INTO `day_weight_tb` (`day_date`, `in_weight`, `out_weight`) VALUES (‘2019-03-08‘, ‘23.41‘, ‘23.441‘); INSERT INTO `day_weight_tb` (`day_date`, `in_weight`, `out_weight`) VALUES (‘2019-01-31‘, ‘11.177‘, ‘4332.26‘); INSERT INTO `day_weight_tb` (`day_date`, `in_weight`, `out_weight`) VALUES (‘2019-01-23‘, ‘11.8‘, ‘17104.49‘); INSERT INTO `day_weight_tb` (`day_date`, `in_weight`, `out_weight`) VALUES (‘2019-03-17‘, ‘17.95‘, ‘13.81‘); INSERT INTO `day_weight_tb` (`day_date`, `in_weight`, `out_weight`) VALUES (‘2019-03-01‘, ‘19.23‘, ‘20.43‘); INSERT INTO `day_weight_tb` (`day_date`, `in_weight`, `out_weight`) VALUES (‘2019-02-05‘, ‘21.55‘, ‘51.0‘); INSERT INTO `day_weight_tb` (`day_date`, `in_weight`, `out_weight`) VALUES (‘2019-02-27‘, ‘13.003‘, ‘23.32‘); INSERT INTO `day_weight_tb` (`day_date`, `in_weight`, `out_weight`) VALUES (‘2019-03-11‘, ‘16.44‘, ‘24.44‘); INSERT INTO `day_weight_tb` (`day_date`, `in_weight`, `out_weight`) VALUES (‘2019-02-28‘, ‘16.48‘, ‘23.4‘);
-- 创建结果表，插入统计结果 drop TABLE if exists week_count_tb; CREATE TABLE `week_count_tb` ( `week_day` varchar(32) DEFAULT NULL, `week_num` varchar(32) DEFAULT NULL, `in_weight` varchar(64) DEFAULT NULL, `out_weight` varchar(64) DEFAULT NULL ) ENGINE=InnoDB DEFAULT CHARSET=utf8; delete from week_count_tb; INSERT INTO week_count_tb SELECT * FROM ( SELECT middle.week_day, middle.week_num, sum(in_weight) in_weight, sum(out_weight) out_weight FROM ( SELECT subdate( date_sub(day_date, INTERVAL 1 DAY), date_format(date_sub(day_date, INTERVAL 1 DAY),‘%w‘) - 7) week_day, WEEK ( date_add(subdate( date_sub(day_date, INTERVAL 1 DAY), date_format(date_sub(day_date, INTERVAL 1 DAY),‘%w‘) - 7),INTERVAL 6 DAY),2) week_num, in_weight, out_weight FROM day_weight_tb ) middle GROUP BY week_day, week_num ) result;
思路：先确定一天是属于一年中的具体周数，再获取到一周中的周末日期，最后根据周数分组求和。
标签：creat create 间隔 form 统计 set 查看 获取 out
原文地址：https://www.cnblogs.com/zengming/p/10743425.html
