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I am using QGIS 3.4 and I want to change all my 0 values to NULL. How can I do that in the attribute table?

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    What have you tried? Where are you stuck? Please Edit the question. – Vince Jun 4 at 13:53
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  • select all your '0' rows -> Go to 'Select by expression' and select all rows where attribute = 0
  • Go to 'Field calculator' and check 'Update existing field', 'Only update selected features' and select your field = NULL

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