A query layer is a layer or stand-alone table that is defined by a SQL query. Query layers allow both spatial and nonspatial information stored in a DBMS to be easily integrated into GIS projects.

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Spatial query in ArcGIS Javascript Api 3.1

I have scenario in which I have to select features drawing a polygon and and get the attribute values in to a tables or lists.The features on the map consist of polygon, line,point at the same time so ...
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How to create a new layer from a selection in QGIS?

I have been using ArcMap for the last three years. But I am now considering switching to Quantum-GIS. Is it possible to create layers from selection in QGIS? I am using QGIS 1.7.4-Wroclaw. UPDATE: ...