前述 SQL中字符串截取函数(SUBSTRING) SQL 字母大小写转换函数UPPER()、UCASE()、LOWER()和LCASE() 题目描述 leetcode题目:1667. 修复表中的名字 Code select user_id, concat( upper(substring(name, 1, 1)), lower(substring(name, 2)) ) as name from Users order by user_id