Hi, with CANCER=yes you point to a column with the name "yes". If you want to use "yes" as a string add quotes: CANCER='yes' -- View this message in context: http://osgeo-org.1803224.n2.nabble.com/Vector-attribute-query-errors-on-a-Mac-tp5365200p5367181.html Sent from the Grass - Users mailing list archive at Nabble.com.