mysql 作為常用數據庫，操作賊六是必須的，對于數字操作相關的東西，那是相當方便，本節就來拎幾個統計案例出來供參考！
order訂單表,樣例如下：
CREATE TABLE `yyd_order` ( `id` bigint(20) unsigned NOT NULL AUTO_INCREMENT, `user_id` int(11) NOT NULL, `order_nid` varchar(50) NOT NULL, `status` varchar(50) NOT NULL DEFAULT '0', `money` decimal(20,2) NOT NULL DEFAULT '0.00', `create_time` timestamp NOT NULL DEFAULT CURRENT_TIMESTAMP, `update_time` timestamp NOT NULL DEFAULT CURRENT_TIMESTAMP ON UPDATE CURRENT_TIMESTAMP, PRIMARY KEY (`id`), KEY `userid` (`user_id`), KEY `createtime` (`create_time`), KEY `updatetime` (`update_time`)) ENGINE=InnoDB;
1. 按天統計進單量，date_format
SELECT DATE_FORMAT(t.`create_time`, '%Y-%m-%d') t_date, COUNT(1) t_count FROM t_order t WHERE t.`create_time` > '2018-05-11' GROUP BY DATE_FORMAT(t.`create_time`, '%Y-%m-%d');
2. 按小時統計進單量
SELECT DATE_FORMAT(t.`create_time`, '%Y-%m-%d %H') t_hour, COUNT(1) t_count FROM t_order t WHERE t.`create_time` > '2018-05-11' GROUP BY DATE_FORMAT(t.`create_time`, '%Y-%m-%d %H');
3. 同比昨天進單量對比，order by h, date
SELECT DATE_FORMAT(t.`create_time`, '%Y-%m-%d %H') t_date, COUNT(1) t_count FROM yyd_order t WHERE t.`create_time` > '2018-05-11' GROUP BY DATE_FORMAT(t.`create_time`, '%Y-%m-%d %H')ORDER BY DATE_FORMAT(t.`create_time`, '%H'),DATE_FORMAT(t.`create_time`, '%Y-%m-%d %H');
4. 環比上周同小時進單，date in ，order by
SELECT DATE_FORMAT(t.`create_time`, '%Y-%m-%d %H') t_date, COUNT(1) t_count FROM yyd_order t WHERE DATE_FORMAT(t.`create_time`,'%Y-%m-%d') IN ('2018-05-03','2018-05-11') GROUP BY DATE_FORMAT(t.`create_time`, '%Y-%m-%d %H')ORDER BY DATE_FORMAT(t.`create_time`, '%H'),DATE_FORMAT(t.`create_time`, '%Y-%m-%d %H');
5. 按照remark字段中的返回值進行統計，group by remark like ...
SELECT DATE_FORMAT(t.`create_time`, '%Y-%m-%d') t_date, COUNT(1) t_count, SUBSTRING_INDEX(SUBSTRING_INDEX(t.`msg`, '{', -1), '}', 1) t_rsp_msg FROM cmoo_tab t WHERE t.`create_time` > '2018-05-17' AND t.`rsp_msg` LIKE '%nextProcessCode%C9000%' GROUP BY DATE_FORMAT(t.`create_time`, '%Y-%m-%d'),SUBSTRING_INDEX(SUBSTRING_INDEX(t.`rsp_msg`, '{', -1), '}', 1);
6. 統計每小時的各金額的區間數統計，sum if 1 0，各自統計
SELECT DATE_FORMAT(t.create_time,'%Y-%m-%d') t_date, SUM(IF(t.`amount`>0 AND t.`amount`<1000, 1, 0)) t_0_1000, SUM(IF(t.`amount`>1000 AND t.`amount`<5000, 1, 0)) t_1_5000, SUM(IF(t.`amount`>5000, 1, 0)) t_5000m FROM mobp2p.`yyd_order` t WHERE t.`create_time` > '2018-05-11' GROUP BY DATE_FORMAT(t.`create_time`, '%Y-%m-%d');
7. 按半小時統計進單量，floor h / 30，同理10分鐘，20分鐘
SELECT CONCAT(DATE_FORMAT(create_time, '%Y-%m-%d %H:' ),IF(FLOOR(DATE_FORMAT(create_time, '%i') / 30 ) = 0, '00','30')) AS time_scope, COUNT(*) FROM yyd_order WHERE create_time>'2018-05-11' GROUP BY time_scope ORDER BY DATE_FORMAT(create_time, '%H:%i'), DATE_FORMAT(create_time, '%Y-%m-%d') DESC ;
8. 成功率，失敗率，臨時表 join on hour
SELECT * FROM (SELECT DATE_FORMAT(t.`create_time`, '%Y-%m-%d') t_date,COUNT(1) '成功數' FROM yyd_order t WHERE t.`create_time` > '2018-05-17' AND t.`status` = 'repay_yes' GROUP BY DATE_FORMAT(t.`create_time`, '%Y-%m-%d')) t1 RIGHT JOIN (SELECT DATE_FORMAT(t.`create_time`, '%Y-%m-%d') t_date,COUNT(1) '總數' FROM yyd_order t WHERE t.`create_time` > '2018-05-11' GROUP BY DATE_FORMAT(t.`create_time`, '%Y-%m-%d')) t2 ON t1.t_date=t2.t_date;
9. 更新日志表中最后條一條日志狀態值到信息表中狀態，update a join b on xx set a.status=b.status where tmp group by userid tmp2，注意索引
UPDATE t_order t0 LEFT JOIN (SELECT * FROM (SELECT * FROM t_order_log t WHERE t.create_time>'2018-05-11' ORDER BY id DESC) t1 GROUP BY t1.user_id ) ON t.user_id=t2.user_id SET t0.`status`=t2.status WHERE t0.`create_time`>'2018-05-11' AND t0.`status`=10;
10. 備份表，create table as select xxx where xxx
CREATE TABLE t_m AS SELECT * FROM t_order;
11. 純改備注不鎖表，快，類型全一致
總結
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