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I have a field calculator expression I use in QGIS to generate unique IDs that are sequential, but start with a text string. I now need to perform the same thing in ArcGIS, but I am unsure of how to start. Here is my QGIS expression:

 'cos' || ( tostring(  $rownum  + 1000000))

I was thinking that in ArcGIS it would be something like this:

 "cos"+InStr( [FID] + 1000000 )

But it returned an error.

Any help would be appreciated. Thanks...

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There are few different ways to do this in ArcGIS Field Calculator.

If you are fine with basing the ID on the FID, you can use:

"cos" + str(!FID! + 1000000) - make sure you set Field Calculator to Python

or

"cos + CStr([FID] + 1000000) - make sure you set Field Calculator to VB

If you want your unique IDs to be sequential and not based on the FID the easiest way is to use a Python codeblock in your Field Calculation:

Codeblock:

rec = 1000000
def autoIncrement():
  global rec
  id = "cos" + rec
  rec += 1
  return id

Expression:

autoIncrement()

The above function will start at the first record in your table with cos1000000 and add 1 to each new record like cos1000001, cos1000002, etc...

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