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From Andrzej <borucki_andr...@wp.pl>
Subject Is possible make bidirectional map key<->value?
Date Sat, 07 Oct 2017 13:57:34 GMT
Is possible such thing:?
two columns: first is bitcoin address, second is index 1,2,3..(0 is 
reserved for no_found)
map address->index:
we get row with address and have index; if not found address we add new 
row with index computed by:
- max (index)+1
-size table +1
If possible fast read this?

And backward: we have index and we must get row with index.
Is something like "natural index" = 0,1,2,3.... ?

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