MySQL - 分组，排序，取出单独的年月日

mysql> select sal from test4 group by testname;

//这里最大最小的就不说了，看一下就懂，注意having是筛选的函数
mysql> select min(sal),testname from test4 group by testname having min(sal)>500;

//这里注意年月日的大小写，不一样的，根据自己需要选择
DATE_FORMAT(bir,'%Y')   //Y四位，y后两位
DATE_FORMAT(bir,'%M')   //M英语，m数字
DATE_FORMAT(bir,'%D')   //D数字后面有th，d纯数组

order by
mysql> select * from test4 order by testId;
//先按照年份排序，年份一样看月份
mysql> select bir,name, DATE_FORMAT(bir,'%Y') y, DATE_FORMAT(bir,'%m') m from mydate order by y,m;

DATE_FORMAT(bir,'%Y') y   //y为别名，简称