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From its very beginning in 1969,
relational theory has depended upon the concept of a domain. For more or
less the entire history of relational database management none of the mainstream
SQL products has supported domains. Instead we have a collection of data
types hardly richer than that of FORTRAN IV. Far from being a mere
theoretical deficiency, this had led to vast amounts of unnecessary application
code, data corruption, misunderstanding, design errors, and endless other
practical, real, and expensive consequences.
In this presentation we introduce the concept of a domain, explain how a domain
is defined, and show some of the enormous practical benefits that would follow
if they were properly supported. We also show how Ingres can be made to support
domains in a limited way.
The presentation is in the form of 40 Microsoft PowerPoint 2000 slides, zipped
to 218kb and inflating to 367kb. |
