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mysql 查询小记 - 笔记搬迁1

笔记搬迁

1、MYSQL对INT和VACHAR很敏感,尤其是MYSQL5.7。比如:

between '1' and '5'

,我查出来的是空,可

between 1 and 5

,数据才出来

2、int 与 vachar (mysql类型转换后无法使用索引)

日期存储 `report_date` char (如 20170325)
where `report_date` = 20170325 (索引用不到)
where `report_date` = '20170325' (索引可用到【必须是字符串类型】)
           

3、复制粘贴专用(自用)

mysql
grant all privileges on *.* to [email protected]"%" identified by "lover";

firewall
firewall-cmd --permanent --add-port=/tcp

内存/CPU 占用 top 
ps aux|head -; ps aux | sort -k4nr | head -
ps aux|head -;ps aux|grep -v PID|sort -rn -k +|head

nginx设置密码
    htpasswd -c -d /usr/local/nginx/conf/vhost/static_pass  username
    location ~ /admin {
            auth_basic "Restricted";
            auth_basic_user_file /usr/local/nginx/conf/vhost/static_pass;//请使用绝对路径
            root   /home/www/admin; //host 地址,不然认证通过之后,找不到对应的文件
    }