Thanks for the answer Jürgen, didnt know that QGIS used normal database
null logic which is fantastic.
Cheers,
Jose
On 26/03/2015 10:53, Jürgen E. Fischer wrote:
Hi José,
On Thu, 26. Mar 2015 at 10:19:10 +0100, José Carlos Martínez Llario wrote:
"amenity" <> 'restaurant' returns 37 rows
"amenity" = 'restaurant' returns 11 rows
The layers has 48 NULL values, so it means that amenity" <>
'restaurant' does not take into account the null values.
Hope this is a bug and not the correct behaviour.
It's the correct behaviour. NULL <> 'restaurant' is NULL, ie. not true.
Use eg. coalesce('amenity','') <> 'restaurant'
Jürgen
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José Carlos Martínez Llario
http://cartosig.upv.es
Producción Cartográfica y SIG.
Dpto. Ingeniería Cartográfica.
Univ. Politécnica de Valencia.
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