SQL31 提取博客URL中的用户名

• 字符串函数

select 
device_id,
substring_index(blog_url,'/',-1) as user_name
substr(blog_url,11) as user_name
from user_submit;

• 替换函数

select 
device_id,
replace('http:/url/','') as user_name
from user_submit

• 截取函数

select 
device_id ,
trim('http:/url/' from blog_url) as user_name 
from user_submit