Hello! I'm newbee here and I want to use the fabrik to following: I give one number and one date(day and time) to system on every use of form. I need the following: - the differences between last date and the actually filled in hour (Y) - the differences between last number and the actually filled (X) - the X/Y Sample: 1st: date and time: 2010.12.28, 21:34 number:9469,9 2nd: date and time: 2010.12.29, 17:08 number:9475,2 result: 0,27/hour (passed hours: 19,56) I have an idea: if I can defind the actual row after the data is filled (or saved) with id and the previuos with (id-1), I can make some operation with php code... Can it work? Plaase send me some tipps! ;D If the system will work, i will buy the bronse subsciption for other projects, but if not... Thanks for your help!