Arcmap replace null

Why have a NULL value in your data? A good example would be an employee database with a termination date field that is set to NULL when the employee is new. Another example would be an elevation field.

More than likely you have fields that allow NULLs because someone created them not paying attention to the defaults. So how do you specify a field to allow NULLs or not? Note some records have NULL values while others have data. First I select a few records. Look what happens. Note the blank records were not selected. This shows that blanks are not the same as NULLs.

You have to be careful of this. Note in this tool I had to use two single quotes with no spaces between for the SQL expression. This selects all NULLs and blanks. So there you have it.

How can I prevent Null form being coerced to zero when exporting an attribute table to a text file? I know. Request Case Start Chat. Translation Feedback How can we make this translation better? Get notified about latest updates to this technical article? Yes No. Do you want to Unsubscribe? Questions or issues with the site? Send Feedback. Please rate your online support experience with Esri's Support website. Below Satisfied. Python uses the keyword None to define null objects and variables.

As the null in Python, None is not defined to be 0 or any other value. In Python, None is an object and a first-class citizen! Right-click the field with null values, and click Field Calculator. How to replace null values in a field in Python? How do I add a field to ArcMap? Add the table to ArcMap. Select Start Editing from the Editor menu. Active Oldest Votes. An automated way of doing this task is by running a python function within Field Calculator no selecting and reverse selecting required , see example below: Additionally, if you want to replace NULL with an empty string just add these two statements: elif value is None: return ''.

Improve this answer. A superior method! Hornbydd Hornbydd Toolbox 'Excel to Table' All the null values are now 0. Join by attributes to the original feature. It all worked very well! Sometimes it is much easier to do things in other programs! Mike Whitton Mike Whitton 1. MelbourneJoe MelbourneJoe 33 5 5 bronze badges. Sign up or log in Sign up using Google.