Syntax
LCASE or LOWER ( CharacterExpression )
A CharacterExpression is
a CHAR, VARCHAR, or LONG VARCHAR data type or any built-in type that is implicitly
converted to a string (except a bit expression).
If the parameter type
is CHAR or LONG VARCHAR, the return type is CHAR or LONG VARCHAR. Otherwise,
the return type is VARCHAR.
The length and maximum length of the returned
value are the same as the length and maximum length of the parameter.
If
the CharacterExpression evaluates to null, this function returns null.