# En el nightt.net (mysql 4):
>> User.find_by_sql("select least(1, null) from users limit 1")
=> [#<User:0xb77141a4 @attributes={"least(1, null)"=>"1"}>]

# En mi workspace (mysql 5):
>> User.find_by_sql("select least(1, null) from users limit 1")
=> [#<User:0x4574f8c @attributes={"least(1, null)"=>nil}>]