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uniq

I tried a lot by Field Calculator but it gives me NULL as you show in table and another try it gives me value 1 in all rows.

Most of examples, on internet they are explaining old version and I have QGIS 3 and I am not sure how can I add id for all rows .

If I want to generate random id, how can I do it also.

I did as suggested in answer $id

enter image description here

But could i ask why the values are not looks like counter, it looks random. If i need to increase by one, how can i do that?

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The easiest and preferred way is to use the processing algorithm "Add Autoincremental Field"

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  • where can i fnd it ,i looked for it but i did not know,where is it located
    – potter90
    Feb 3 '20 at 14:46
  • 2
    Processing -> Toolbox and search for it. Feb 3 '20 at 14:49
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The simplest answer is the $id variable.

Be careful though, it doesn't auto-increment after your first field calculation.

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