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It's working. Thank you.

Hello I have a problem. Can anybody help me please? I have a querie from where I like to get only a latest value from individual id_machin. It is look like that. id_field | id_machin | date | counter | ------------------------------------- .....1.............1.....18.3.04....1000...

Thanks. You helped me a lot.

Yes that's right. Do you have any idea how can I solve this problem?

calculate a difference between two values Hello. I would like to calculate in querie a difference between two values and I have no idea how to do that. Please help me. My querie look's like that. id_field | id_machine | counter | distinction ----------------------------------------------...

What is T2 and T3 in this formula? I have only one table.

calculating differences between two values I have a problem. Can anybody help me? My problem is: I have a querie something like that. I need a formula witch will calculate field_x ?? id_field..|.. date_of ..|..counter.....|....field_x -------------------------------------------------------...