[Qgis-user] Edit attribute table rows

[Lester Anderson]

Hello Andreas,

Selecting the rows where depth = NULL is fine. The field calculator
does not update the depth with the depth where known values are
present.

Only update selected features is checked, update existing field
checked, with output field set to depth:
Expression: tried just "depth" and also "depth"="depth".

Have I missed something here?

Thanks

On 8 April 2016 at 12:30, Neumann, Andreas <a.neumann at carto.net> wrote:
> Sure.
>
> It is a two-step thing:
>
> 1. Select all records where Depth IS NULL. Use the "Select Features using an
> expression" button (the Epsilon sign) for that and "depth IS NULL" as an
> expression
>
> 2. Use the field calculator and only update the selected records (the top
> checkbox in the field calculator).
>
> You can find details about the field calculator in the QGIS manual.
>
> Hope this helps,
>
> Andreas
>
> On 2016-04-08 13:18, Lester Anderson wrote:
>
> Hello,
>
> I have an attribute table of earthquake data (focal mechanism beach
> balls) and need to edit the depth attribute. Each ball is defined by
> two rows in the table, eg first ball
>
> Row_ID Strike Dip Rake Magnitude Quadrant Depth
> ----------------------------------------------------------
> 0 NULL NULL NULL NULL Tensional and Compressional NULL
> 1 233 38 -96 6.77 Compressional 623
> 2 NULL NULL NULL NULL Tensional and Compressional NULL
> 3 68 36 83 5.7 Compressional 39
> etc
>
> where rows 0,1 and 2,3 represent separate beach balls, so basically it
> is a row calculation
>
> What I need to do is replace the Depth NULL value with the depth 623
> etc for each entry. Is there an easy way of doing this?
>
> Thanks
>
> Lester
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