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I have a shapefile which contains all German Zip-Codes in a a five-digit format (e.g. 80637). For what I intend to do, this is way to much detail. I would like to aggregate all Zip-Code areas by the first two digits (e.g. 80).

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My approach is ordering ZIP codes in the QGIS attributes table numerically, then selecting them manually, then joining them. This is somewhat cumbersome I'll have to do this a hundert time.

Is there a way of doing this programmatically? I tried automate this process following this instruction, but I failed at importing sextante.

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create a new field and copy the first two digits from the left using the field calculator

-> for text, you can use (left(fieldname,2)) in the field calculator. With numeric field you can use floor(fieldname/1000)

dissolve your polygons based on this new field

-> this command is in vector -> geometry -> dissolve

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    I suggest to use text fields. Otherwise the leading 0 in East German postal codes gets lost.
    – AndreJ
    Apr 14 '14 at 14:32
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    Thanks for the quick response and saving me a lot of time. The field calculator is a mighty tool I've never noticed/used before. I think this solution can be applied to many problems.
    – stekhn
    Apr 14 '14 at 15:25
  • is it possible to export the 2 digit zip code layer as it's own 2 digit zipcode shapefile? Mar 8 '16 at 17:31
  • I don't understand your comment. maybe you could ask a question with some more details.
    – radouxju
    Mar 8 '16 at 19:29

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