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user 92626
class for parsing and evaluation of expressions in QGIS API. Don't use this tag for non programming related questions, if you are talking about QGIS expressions use qgis-expression tag instead.
7
votes
Filling field with automatic numbering specific by unique value of another field using QGIS ...
Finally, I found the right expression to do that:
"TOWN" || (@row_number - minimum(@row_number, "TOWN") + 1)
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