IVOA Recommendation: IVOA Astronomical Data Query Language Version 2.00

@article{Ortiz2008IVOARI,
  title={IVOA Recommendation: IVOA Astronomical Data Query Language Version 2.00},
  author={I{\~n}aki Ortiz and Jeff Lusted and Patrick Dowler and Alexander S. Szalay and Yuji Shirasaki and Mar{\'i}a A. Nieto-Santisteban and Masatoshi Ohishi and William O'Mullane and P. Osuna and the Ivoa Registry Working Group and the Ivoa Registry Working Group},
  journal={arXiv: Instrumentation and Methods for Astrophysics},
  year={2008}
}
This document describes the Astronomical Data Query Language (ADQL). ADQL has been developed based on SQL92. This document describes the subset of the SQL grammar supported by ADQL. Special restrictions and extensions to SQL92 have been defined in order to support generic and astronomy specific operations. 
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