mysql count max min 语句用法

max用法

$sql="select max(id) as maxid from e_user";
$sql="select id as maxid from e_user order by id desc limit 0,1";

min用法

$sql="select min(id) as minid from e_user";
$sql="select id as minid from e_user order by id desc limit 0,1";

sum 用法 求总和

$sql="select sum(id) as total from e_user";

AVG 用法 求平均值

$sql="select avg(id) as total from e_user";

mysql count max min 语句用法

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