题解 | #顾客登录名#
顾客登录名
http://www.nowcoder.com/practice/7cbf5e3082954c21a80fc750ce97350f
select cust_id,
cust_name,
#upper(concat(left(cust_name,2),left(cust_city,3))) as user_login
upper(concat(substring(cust_name,1,2),substring(cust_city,1,3))) as user_login
from Customers
cust_name,
#upper(concat(left(cust_name,2),left(cust_city,3))) as user_login
upper(concat(substring(cust_name,1,2),substring(cust_city,1,3))) as user_login
from Customers
拼接concat
字符串相关函数 upper转大写,lower小写
substring 子字符串
left/right返回从左、右开始对应个数字符串

