I have a database that has primary keys starting from 1 and serially incrementing by 1.

Am trying to change it using Replace field contents

How do I do the calculation that the final PK looks like

DOC0001, DOC0002 (from 1,2...)

"DOC" & (0000+PK)

didnt help much

Got it

PaddedText() function @ briandunning.com

Just so you know ... you can enter "DOC0001" as the serial Number/Code in full and FileMaker will handle it correctly, no calculation needed.

This will also prevent the forthcoming issue you will have when you hit 10+

Your current calc will result in:

DOC0001

DOC00010

DOC000100

If you need the prefix to be dynamic you can use:

DOC & Choose ( Length ( PK ) ; "0000" ; "000" ; "00" ; "0" ) & PK

best

Stuart

you can enter "DOC0001" as the serial Number/Code in full and FileMaker will handle it correctly, no calculation needed.

Make sure the field type is Text, if you do that.

Thanks