We are the MapBasic programmers. We write a application to select a group
of polygon into selection. We use the spatial SQL statements.
We want to find out the polygons in Table1 that are not contained by
the polygons in Table2.

Ex. Select Obj From Table1 Where not (Obj within any(Select Obj From

With the Table1 of more than 30000 polygons,the Table 2 more than 20000
, the time is very slow. It takes more than 10 minutes.
But we have to do it very often.

If anyone knows a solution to speed up this process, please
help us.

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