I have bunch of polyygons, all with different area-size. I want to find polygons with areasize between 300-500. Normally I would pick out everyone above 300 (query1) and then commit a new query on ...
I have a problem with group same data to count it. for example, i want to group same code to one and count them. i can do it when i use MapInfo (Pic 1) but i can't in QGIS. (Pic 2: i can classify ...
I have a table that contain several columns, each has their own data. then, someone have made some change in the data (just a little one data editing). how do i know later what data have been ...
I have two shapefiles from a client, one is their entire network (complete with unique IDs) and another a selection I need. However the selection file does not have unique IDs but the entire one does. ...
I'm struggling to get what seems like a perfectly normal query to execute in MapInfo v10. In SQLite Manager (an excellent firefox plugin), this works as expected: SELECT area_name, street_name, ...