Autonumber? or sql? or how?

I have a child (detail) block in tubular form. I need to have a field that will number each row/results after the master is queried. ie.
MASTER = company
details= employees
details block looks like this:
NUMBER | NAME | LAST_NAME |ADDRESS
1
2
3
4
so I need that for every new record on the detail block, the next number is generated. So if a new employee gets inserted for this compay, the field "Number" created will be 5. by the same token if a company has 2 records, then the next time someone gets inserted they receive the value of 3 and so on.
can you guys please help me with this? I dont even know where to start.
thanks!

The above procedure (seqno_prc) have some bugs, for example if the user deletes
a row in the detail block, the sequence of the rows above and rows down this deleted row will not change, it should recalculated.
It's better to generate squence of the detail rows just before saving the form.
For me i use when-button-pressed for a save button then i navigate through the detail block , increment the counter and fetch it's value on the item that have the row number, then commit the form .
and everythig is working fine.

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# {message:id=4189517}
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Autonumber? or sql? or how?

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