🚀 go-pugleaf

Thanks to everyone who responded. Here's a summary of what I've found.
All these packages work with Windows.

By the way, I mentioned db_VISTA III, but that is a "read-only" SQL (you
can't do updates). If you want to do real development, you pay $700 plus
they'll charge a royalty for each copy of your application that you sell.
As far as I'm concerned, until they get the "write" part of their SQL
working, they don't even qualify as an SQL product.

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Borland's Paradox Engine 2.0 can be queried with SQL with a separate
package that you buy from Borland. For a limited time, Paradox Engine sells
for $100, not including the SQL Link that enables SQL queries of the Paradox
database.
 
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Ocelot SQL for Windows. $200, but if you want to develop software with it,
you need to pay an additional $500 (royalty fee or something). Total cost
is $700 with no additional royalties.

		Ocelot Computer Services Incorporated
		#1502  10025 - 106 Street
		Edmonton, Alberta T5J 1G7
		CANADA

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Gupta's SQL server package is supposed to be expensive but worth it.

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Novell.  NetWare SQL is the distributed version.  NetWare XQL (Xtrieve
Querey Language) is the stand alone. Windows support has been announced
but not verified.

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ADI Software in Karlsruhe will release SQL for Windows in June; the price
will be about $350.