Weird result from query...?

Hi, Just been getting some weird results from a query...can anybody tell me why..? Basically am sending 3 variables via a link on the page... http://localhost/show_accounts.php?o=8927437717300145&n=shane&p=4.78 which runs the sql in show_accounts.php: SELECT *,now()-0 from ".$tcname." where oorder='".$o."' and nname='".$n."' and total='$p' (globals is off and i am assigning the variables on top of the page. eg: $o=$_GET['o'],) my tables structure is: oorder varchar(20) // varchar because I will have dashes and underscores in it. nname varchar 60 total float(6,2) I have checked the database and I DO have a record that matches the SQL above but it does not return a result _unless_ the decimal spaces have two zeros in it, eg: 4.00 works fine 1.00 works fine 77.00 works fine 4.77 does not work 1.42 does not work etc I have taken out the purchase amount and everythings running fine...but am just curious as to what was actually causing the problem...any ideas? Cheers, -Ryan