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Developed 'period'

Redundancy of syntax consist of two items:

Besides this, syntax is not usable to extract invisible records by force, especially if time interval is specified not by constants, but by sub-query

Earlier service words 'union, intersect, except' used for operations upon time ranges, and coincides by names with operations for records - what was simply criminal, because it created cognitive dissonance (different intities must not be designated by identical name).

Use of usual arrays refers to operations upon arrays which names do not coincide with 'union, intersect, except', and thus reduce cognitive dissonance elegantly.

P.S.

Article clirifies p.220-221 of pdf-document.



Dmitry Turin, dmitryturin@yandex.ru



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