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'NULL' is not appearing in my QGIS attribute tables. Columns that used to have 'NULL' in them are now just empty.

What could be the problem?

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    When you say used to have NULL in them what do you mean? Did you change anything? My first thought is that they've been replaced with string that's just empty. – scabecks Sep 9 '17 at 6:19
  • Thanks, I mean, the empty spaces used to be "null', now they are just empty. I am new to qgis and having those null values was useful when writing command queries. But with empty spaces now, I can't figure how to write these commands anymore. – AdeB Sep 9 '17 at 10:32
  • Just to check your settings... Can you open Settings | Options | Data Sources (tab) and see Representation for NULL values (in Feature attributes and table)`? In my case it is NULL. – Kazuhito Sep 9 '17 at 12:18
  • I confirmed this strange behavior with QGIS 2.18.12. Then testing in reverse order: 2.18.11 to 2.18.7, the same. Looks like this is persistent. Removing .qgis2 folder has not work out so far. (I usually use QGIS 2.14 and have never seen this...) – Kazuhito Sep 10 '17 at 12:55

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