> Select
>    H1.ID
> from
>    HASH1 H1
> where
>    x1_y1 BETWEEN min11 AND max11 AND
>    x1_y2 BETWEEN min12 AND max12 AND
>    x1_y3 BETWEEN min13 AND max13 AND
>    x1_y4 BETWEEN min14 AND max14 AND
>    x1_y5 BETWEEN min15 AND max15;
>
>

no it's not work at all !! without an rtree index the speed is a total 
disaster (several minutes)
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