[Qgis-user] CASE WHEN .... Field Calculator.

[Matías Taborda Barroso]

Hi.

I'm spanish user, sorry for my English. I'm using Google translator.

I have a .shp points file with attribute table. Like this...

-- A --     -- B --      -- C --
  QString     Double        Double        Data type
30STH400500     1            30
30STH400500     1            30
30STH400500     1            30
30STH400500     1            30
...........    ...          ...
...........    ...          ...

30STH400500     2            10
30STH400500     2            10
30STH400500     2            10
30STH400500     2            10
...........    ...          ....
...........    ...          ....

30STH400500     3            20
30STH400500     3            20
30STH400500     3            20
30STH400500     3            20
...........    ...          ....
...........    ...          ....

30STH450450     1            10

...............................
...............................

I have 50 different valuesv of A field.

And now, I want a new field, "D" (Data type, double) like this in field
calculator:

WHEN "A"='30STH400500' THEN *D = 30 + 20 + 10 = 50*

I don't know if I have explained it.

I've tried using CASE WHEN A..... THEN .... ELSE but I don't get it.

I think that with plugin Fieldpyculator, but I don't know python

Please, help me.

Thanks.
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