Spatial Data Query & State of Database After Query (Especially for GATE-Geospatial 2022)

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A spatial query is a special type of database query supported by geodatabases and spatial databases. The queries differ from non-spatial SQL queries in several important ways. Two of the most important are that they allow for the use of geometry data types such as points, lines, and polygons and that these queries consider the spatial relationship between these geometries.

For example, a spatial query might find which points are contained within a polygon or set of polygons; find features within a specified distance of a feature, or find features that are adjacent to each other.

Spatial Queries

Only looks at the location information, instead of the attribute tables. These queries involve distance, locations within areas.

This Image Shows Spatial Dtaabase Query

State of Table After Spatial Queries

After a query is carried out, any further operations are carried out on only the subset, usually highlighted in a light blue. A table or layer may be in one of three selection states:

  1. No selection (default state)
  2. No features selected (zero records selected)
  3. Some features selected (some returned number of selected features)
This Diagram Shows Three Selection States of Spatial Query

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