I make a new column in my attribute table and it has a default value (for example 0). I want to (probably using the field calculator) have the result that row 1 has the value 1, row 2=2 and so on, just like a numbered index.
I'd be thankful for a code example for the field calculator (including the use of $rownum (I think I need this for switching to the line)).
Answer
Just put $rownum (QGIS 2) or @row_number (QGIS 3+) as the expression. Simple as that. :)
An up-to-date list of all the field calculator functions can be read in the official docs.
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