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ST_MultiPolygon 是零个或多个 ST_Polygon 值的集合,且所有多边形都位于空间参照系内。
SQL/MM (ISO/IEC 13249-3: 2006) 9.6
ST_MultiPolygon 构造函数类型 ST_MultiPolygon 的 ST_MultiPolygonAggr 方法