The LOWER function, used to convert strings to lowercase, is the same in both MSSQL and MySQL.
LOWER converts a string to lowercase. It's similar to UPPER, which converts a string to uppercase.
Syntax:
LOWER(string)
Examples:
select lower('This is demo');
------------------------
this is demo
select lower(name) from emp;
-------------------------
smith
john
scott
thomas

In MySQL, the same functionality is available with LOWER or LCASE — LCASE is a synonym for LOWER.
Syntax:
LOWER(string)
LCASE(string)
Example:
mysql> select lower('This is Demo');
+-----------------------+
| lower('This is Demo') |
+-----------------------+
| this is demo |
+-----------------------+
mysql> select lcase('This is Demo');
+-----------------------+
| lcase('This is Demo') |
+-----------------------+
| this is demo |
+-----------------------+
