sddaaa的博客

yum install perl -y yum install libaio -y yum install net-tools -y yum install numactl -y 修改默认密码 ALTER USER 'root'@'localhost' IDENTIFIED BY 'new_password'; ALTER USER user() IDENTIFIED BY 'new_password';

-------注意sum函数 是统计合------- select name, sum(case when course='java' then grade end) as java, sum(case when course='C++' then grade end) as C++, sum(case when course='C#' then grade end) as C# from...