Greetings, pgsql-general!
Well, I promised to write this article and must admit that it turns out
much harder than I thought.
The very first draft is here: http://beta.rdw.ru/stuff/comparison.html
Please check it and correct factual errors(!) / speling, etc.
If someone has some stuff ready to put into it, don't hesitate to
send.
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Yours, Alexey V. Borzov, Webmaster of RDW.ru