I will probably try PostGreSQL for my needs as it seem powerful enough
and easy to ship to my potential customers.
For the data provider i will try npgsql as you and others suggested,
as it seem enough reliable and stable to be used efficiently.
I will probably use newsgroups again later if and when i will have
more specific issue, in the meanwhile i go back to links you have
provided me to read faqs for pgsql and npgsql.
Thanks everybody for your help and suggestions.
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TIP 9: In versions below 8.0, the planner will ignore your desire to
choose an index scan if your joining column's datatypes do not
match
