How to use the LOWER() function in MySQL

SELECT LOWER('MySQL字符串函数') AS str1, LCASE('MySQL字符串函数') AS str2;
str1          |str2          |
--------------+--------------+
mysql字符串函数|mysql字符串函数|

SELECT LOWER(BINARY 'MySQL字符串函数') AS str1,
       LOWER(CONVERT(BINARY 'MySQL字符串函数' USING utf8mb4)) AS str2;
str1               |str2          |
-------------------+--------------+
MySQLå­ ç¬¦ä¸²å ½æ °|mysql字符串函数|