mysql 作為常用資料庫，操作賊六是必須的，對於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,'%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. 環比上週同小時進單，date in ，order by

SELECT DATE_FORMAT(t.`create_time`,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');

5. 按照remark欄位中的返回值進行統計，group by remark like ...

SELECT DATE_FORMAT(t.`create_time`,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);

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,SUM(IF(t.`amount`>0 AND t.`amount`<1000,1,0)) t_0_1000,SUM(IF(t.`amount`>1000 AND t.`amount`<5000,0)) t_1_5000,　　SUM(IF(t.`amount`>5000,0)) 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`,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`,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. 更新日誌表中最後條一條日誌狀態值到資訊表中狀態，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. 純改備註不鎖表，快，型別全一致

總結

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