Attribute Data Query: Logical Expressions, Types of Operations, Relational Database Query, SQL (Especially for GATE-Geospatial 2022)

Doorsteptutor material for CTET-Hindi/Paper-1 is prepared by world's top subject experts: get questions, notes, tests, video lectures and more- for all subjects of CTET-Hindi/Paper-1.

Examrace Books on Mapping, GIS, and Remote Sensing prepares you throughly for a wide range of practical applications.

An attribute query is a way to search for and retrieve records of features in a set of data based on its attribute values.

The selected data subset can be simultaneously examined in the table, displayed in charts, and linked to the highlighted features in the map.

An attribute query is any SQL query used to select map features based on their attribute values. Attribute queries use Boolean algebra (and, or, not) , set algebra arithmetic operators , and user-defined values.

Such queries are fundamental and an important first step in defining, working with, and analyzing GIS data. An alternative to using attribute query is to perform a spatial selection.

There are many attribute data queries that are given below:

Diagram Shows Types of Attribute Data Queries

Developed by: