Selecting features with NULL attributes in QGIS
Geographic Information Systems Asked on July 15, 2021
How do I identify which features have NULL attributes in the attribute table of a shapefile?
When i try [field]= 'NULL' it selects the features with value = 0 (see picture)
4 Answers
Have you tried replacing the "=" with "is"? I don't have QGIS in front of me, but that is pretty common database select syntax for working with NULL values.
pedonal is NULL
Correct answer by RyanKDalton on July 15, 2021
Try:
Pedonal = ''
- that should work!
Answered by Darren Cope on July 15, 2021
I beat my brains about this one. The field name is "ASSETID", it is either a value or NULL. But actually the field was a text field (KML). I tried..
"ASSETID" ISNULL, "ASSETID" IS NULL, ISNULL("ASSETID"), "ASSETID" = "" NOTHING WORKED!
However
"ASSETID" = '', "ASSETID" IN ('') did work also for search "ASSETID" in ('2251', '4321' etc)
Archaic but workable.
Answered by John Groat on July 15, 2021
This video instructs you how to update these selected Null values from another shapefile (layer). https://youtu.be/O2hkvJjR2_s
Answered by Huynh Kosmos on July 15, 2021
Add your own answers!
Ask a Question
Get help from others!
Recent Answers
- Lex on Does Google Analytics track 404 page responses as valid page views?
- Jon Church on Why fry rice before boiling?
- Peter Machado on Why fry rice before boiling?
- Joshua Engel on Why fry rice before boiling?
- haakon.io on Why fry rice before boiling?
Recent Questions
- How can I transform graph image into a tikzpicture LaTeX code?
- How Do I Get The Ifruit App Off Of Gta 5 / Grand Theft Auto 5
- Iv’e designed a space elevator using a series of lasers. do you know anybody i could submit the designs too that could manufacture the concept and put it to use
- Need help finding a book. Female OP protagonist, magic
- Why is the WWF pending games (“Your turn”) area replaced w/ a column of “Bonus & Reward”gift boxes?