mysql 內置功能 函數 date_format函數
阿新 • • 發佈:2018-11-13
create 準備 orm etime tab rem from ima ros
創建數據庫db12
create database db12 charset=utf8; use db12;
準備表和記錄
CREATE TABLE blog ( id INT PRIMARY KEY auto_increment, NAME CHAR (32), sub_time datetime );
插入記錄
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‘);
提取sub_time字段的值,按照格式後的結果即"年月"來分組
mysql> select date_format(sub_time,‘%Y-%m‘),count(id) from blog group by date_format(sub_time,‘%Y-%m‘); +-------------------------------+-----------+ | date_format(sub_time,‘%Y-%m‘) | count(id) | +-------------------------------+-----------+ | 2015-03 | 2 | | 2016-07 | 4 | | 2017-03 |3 | +-------------------------------+-----------+ 3 rows in set (0.00 sec)
mysql 內置功能 函數 date_format函數