1、创建基础表(按天统计)
CREATE TABLE num (i INT); INSERT INTO num (i) VALUES (0),(1),(2),(3),(4),(5),(6),(7),(8),(9); -- 测试表 DROP TABLE IF EXISTS `user`; CREATE TABLE `user` ( `id` int(11) NOT NULL AUTO_INCREMENT, `username` varchar(32) NOT NULL COMMENT '用户名称', `birthday` date DEFAULT NULL COMMENT '生日', `sex` char(1) DEFAULT NULL COMMENT '性别', `address` varchar(256) DEFAULT NULL COMMENT '地址', `sign_date` varchar(100) DEFAULT NULL, PRIMARY KEY (`id`) ) ENGINE=InnoDB AUTO_INCREMENT=6 DEFAULT CHARSET=utf8; INSERT INTO `user` VALUES ('1', '小南', '1991-04-04', '男', '湖南湘潭', '2018-03-13'); INSERT INTO `user` VALUES ('2', '小谭', '1981-01-27', '男', '湖南湘潭', '2018-03-12'); INSERT INTO `user` VALUES ('3', '小梅', '1981-04-28', '女', '广东梅县', '2018-04-14'); INSERT INTO `user` VALUES ('4', '小仪', '1986-04-12', '女', '四川仪陇', '2018-03-13'); INSERT INTO `user` VALUES ('5', '小蓝', '2001-01-01', '女', '上海嘉定', '2018-03-15');
2、查询时间范围
SELECT adddate('2018-03-01', numlist.id) AS 'date' FROM ( SELECT n1.i + n10.i * 10 + n100.i * 100 AS id FROM num n1 CROSS JOIN num AS n10 CROSS JOIN num AS n100 ) AS numlist WHERE adddate('2018-03-01', numlist.id) <= date_add('2018-03-01',interval 1 month)
SELECT left(sign_date,10)as udate,count(sign_date) unmber FROM user GROUP BY udate
SELECT temp.date, coalesce(u.unmber,0) 'number' from( SELECT adddate('2018-03-01', numlist.id) AS 'date' FROM ( SELECT n1.i + n10.i * 10 + n100.i * 100 AS id FROM num n1 CROSS JOIN num AS n10 CROSS JOIN num AS n100 ) AS numlist WHERE adddate('2018-03-01', numlist.id) <= date_add('2018-03-01',interval 1 month)) temp LEFT JOIN (SELECT left(sign_date,10)as udate,count(sign_date) unmber FROM user GROUP BY udate) u on temp.date = u.udate order by temp.date
查看结果集
按月统计差不多,上面的懂了,下面的是一样的
SELECT left(temp.date,7), coalesce(u.unmber,0) 'number' from( SELECT adddate('2018-01-01', interval numlist.id month) AS 'date' FROM ( SELECT * from (SELECT n1.i + n10.i * 10 AS id FROM num n1 CROSS JOIN num AS n10) a where a.id<=11 ) AS numlist WHERE adddate('2018-01-01', interval numlist.id month) <= '2018-12-01') temp LEFT JOIN (SELECT left(sign_date,7)as udate,count(sign_date) unmber FROM user GROUP BY udate) u on left(temp.date,7) = u.udate ORDER BY temp.date
查看结果
SqlServer有生成0...x的函数,mysql不知道是哪个函数,只能建表了=.=
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