cql: Flat file database query language

Authors:
Glenn Fowler
Affiliations:
AT&T Bell Laboratories, Murray Hill, New Jersey
Venue:
WTEC'94 Proceedings of the USENIX Winter 1994 Technical Conference on USENIX Winter 1994 Technical Conference
Year:
1994

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Abstract

cql is a UNIX system tool that applies C style query expressions to flat file databases. In some respects it is yet another addition to the toolbox of programmable file filters: grep [Hume88], sh [Bour78] [BK89], awk [AKW88], and perl [Wall]. However, by restricting its problem domain, cql takes advantage of optimizations not available to these more general purpose tools. This paper describes the cql data description and query language, query optimizations, and provides comparisons with other tools.