https://www.spdba.com.au/stextractpolygon-extract-polygons-from-result-of-stintersection-in-sql-server-spatial/
STExtractPolygon: Extract Polygons from result of STIntersection in SQL Server Spatial - The...
Nov 30, 2020 - Oracle customers have asked me for help in the past dealing with compound objects or collections that result from thinning or geoprocessing (intersection etc)...
sql server spatial
https://lists.osgeo.org/pipermail/postgis-users/2008-July/020579.html
[postgis-users] Compare SQL Server 2008 Spatial, PostGIS, MySQL functionality
sql serverpostgisuserscomparespatial