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(substring(cust_contact,1,2),substring(cust_city,1,3))) user_login
from Customers;
#字符串使用concat函数,而不是java编程里的+号

