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NOTE 199 - Table Query Language

Ger van Diepen, ASTRON Dwingeloo

2006 May 27


The Table Query Language (TaQL) is an SQL-like high level language to do operations like selection, sort and update on a table. It is a very versatile language with full support for table columns containing array data. It has a very rich set of functions (like cone search and array reduction) making it very suitable for astronomical applications. It also has full support of nested queries. An operation that can be expressed in a single function is the matching of two sky catalogues.
A binding in C++ and Glish is available. A Python binding is expected before fall 2005.

A (gzipped) postscript version of this note is available (137kB).

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