mysql字符串的大小写转换

SELECT UPPER('MySQL字符串函数') AS str1, UCASE('MySQL字符串函数') AS str2;

str1          |str2          |

--------------+--------------+

MYSQL字符串函数|MYSQL字符串函数|

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|