sql server 最常用函数速查表函数说明示例len()返回字符串长度select len(hello) as result; -- 5lower()转小写select lower(SQL) as result; -- sqlupper()转大写select upper(sql) as result; -- SQLsubstring()截取字符串select substring(abcdef, 2, 3) as result; -- bcd…
一、注册后台模型
1.终端创建超级管理员
(使用的密码是12345678)
python manage.py createsuperuser
Username (leave blank to use hk): admin
Email address: adminqq.com
Password:
Password (again):
This password is too common.
This password…