OK, I re-added the original data.
The numeric column kod is in the Double format, Precision 15, Scale 6, Number of decimal places 6, Number of significant digits 6. Tha example of the data is 500011, 500020, 500046, 500259, 500291 etc.
Now I'll make a calculation for the text column in the Text format, Length 6.
It's given me the exact same numbers, but there is also .0 at the end of each. For example 500011.0, 500020.0, 500046.0.
This is good, I'm getting closer Now I just need to figure out, how to cut the .0 at the end. Should I change the number of significant digits from 6 to 5? Or something else?