NOW() -- 获取当前格式化时间
- 原表
mysql> CREATE TABLE blog (-> id INT PRIMARY KEY auto_increment,-> NAME CHAR (32),-> sub_time datetime-> );
Query OK, 0 rows affected (0.01 sec)mysql> INSERT INTO blog (NAME, sub_time)-> VALUES-> ('第1篇','2015-03-01 11:31:21'),-> ('第2篇','2015-03-11 16:31:21'),-> ('第3篇','2016-07-01 10:21:31'),-> ('第4篇','2016-07-22 09:23:21'),-> ('第5篇','2016-07-23 10:11:11'),-> ('第6篇','2016-07-25 11:21:31'),-> ('第7篇','2017-03-01 15:33:21'),-> ('第8篇','2017-03-01 17:32:21'),-> ('第9篇','2017-03-01 18:31:21');
Query OK, 9 rows affected (0.00 sec)
Records: 9 Duplicates: 0 Warnings: 0- 对表进行数据插入,插入数据为当前时间
mysql> insert blog(name,sub_time) values('第10篇',NOW());
Query OK, 1 row affected (0.00 sec)
date_format -- 对时间进行格式化操作
- 查看每个月都分别发表了几篇文章
mysql> select date_format(sub_time,'%Y-%m') as 时间,count(id) as 发表数量 from blog group by date_format(sub_time,'%Y-%m');
+---------+--------------+
| 时间 | 发表数量 |
+---------+--------------+
| 2015-03 | 2 |
| 2016-07 | 4 |
| 2017-03 | 3 |
| 2020-09 | 1 |
+---------+--------------+
4 rows in set (0.00 sec)
方法求最大值的介绍)
