题解 | 顾客登录名
顾客登录名
https://www.nowcoder.com/practice/7cbf5e3082954c21a80fc750ce97350f
select
cust_id,
cust_name,
upper(
concat(left(cust_contact,2),
substring_index(cust_city,' ',1))
) AS user_login
from Customers;
