mysql乱码
免安装mysql的目录下只有一个my-default.ini,而且打开也没有character-set-server
不急,先把它拷贝一份,并重命名为my.ini,这样该目录下就有了my.ini和my-default.ini两个ini文件
然后打开my.ini加上以下代码
[client] default-character-set=utf8 [mysqld] character-set-server=utf8
MySql取中位数
1select group_concat(id), avg(value) from ( #最外层开始 2select id, value from ( #第二层开始 3select id, @index:=@index+1 as myindex, value from student, (select @index:=0) AS initvar order by value #最内层 4) as t where floor(@index/2+1)=myindex or ceil(@index/2)=myindex #第二层结束 5) as x