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_contact,2),left(cust_city,3)))
as user_login
from Customers;
/*
upper():小写转大写
concat(s1,s2):连接两个字符串
left(column_name,int size):取字符串左边 size个字符
*/
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