>I don't know how to detect if the first or the second element are "geometry >empty".
Resolved. I can use the ST_IsEmpty(ST_GeometryN(geom, 1)) ST_IsEmpty(ST_GeometryN(geom, 2)) to test the first and the second element of geom-collection. - ----------------- Andrea Peri . . . . . . . . . qwerty àèìòù -----------------
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