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This question already has an answer here:

We've recently started working with ArcMap, having used MapInfo previously. I've created a shapefile in ArcCatalog and want to update some columns using SQL. In MapInfo I'd write the following command in the MapBasic window.

UPDATE Clearance SET GTID = "GT" & FID

I can't find where to do this in ArcMap - any pointers?

marked as duplicate by PolyGeo Nov 20 '15 at 3:43

This question has been asked before and already has an answer. If those answers do not fully address your question, please ask a new question.

6

Use the field calculator. An answer to another question explains how to do this: Setting value of field in all selected rows of table using ArcGIS Desktop?

There are also examples in the help: http://help.arcgis.com/en/arcgisdesktop/10.0/help/index.html#/Calculate_Field_examples/005s0000002m000000/

You could also use the calculate field tool.

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