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The Free On-line Dictionary of Computing (foldoc)

A roll-your-own {database}, created in the {Unix} toolkit
philosophy. It appears to be written in the {awk} language,
and is very compatible with awk. It uses awk's syntax and can
be combined with awk commands.

The definitive introduction is "Unix Relational Database
Management: Application Development in the Unix Environment",
by Rod Manis, Evan Schaeffer, and Robert Jorgensen, published
by Prentice Hall. The book tells how to use rdb to create
database/spreadsheets in the awk tradition, only easier. It's
a good way to get into programming for novices. It's also a
good way to learn DB theory and construction quite painlessly.