Flat File Database Query Language
AT&T Bell Laboratories
Murray Hill, New Jersey 07974
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
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