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Astronomical Data Query Language
Query language for astronomical data From Wikipedia, the free encyclopedia
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Astronomical Data Query Language (ADQL) is a language for astronomical data query based on SQL 92.[1]
Overview
ADQL is a specialized variant of the SQL query language adapted for accessing the astronomical datasets of the virtual observatory,[2] via the Table access protocol (TAP).[3] ADQL is designed to handle large datasets distributed over several locations,[4] while not retrieving data that is not needed.[5]
Language
ADQL is a query language that allows data to be retrieved via a single command, the select statement, which is designed to perform as the select statement in the SQL language.[2] ADQL has extensions designed to improve handling of astronomical data such as spherical co-ordinates that are not handled by standard SQL.[2]
Implementations
Example
SELECT source_id, ra, dec
FROM gaiadr1.tgas_source
WHERE phot_g_mean_flux > 13
References
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