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I'm designing a PostGIS database with country polygon and many layer polygons of water areas, inside these country polygon. I need to generate inverse polygons to water polygons, that doesn't contain water polygon.

Something like to my question is published there How to find polygons inside polygon with PostGIS 2.0. The main question is it real to generate polygons with PostGIS in the main country polygon that doesn't contain water polygons?

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