Returns the geometry which represents the geometric parts og geom1 and geom2 that do not intersect. It is called symmetric because
ST_SymDifference(geom1,geom2) = ST_SymDifference(geom2,geom1). It can be understand as: ST_Union(geom1,geom2) - ST_Intersection(geom1,geom2).
1 geo.symDifference
<geo.symDifference ora_tol='ora_tol'>
<geom1> *
<geom1 /> *
</geom1>
<geom2> *
<geom2 /> *
</geom2>
</geo.symDifference>
| Attributes | |||||
|---|---|---|---|---|---|
| Name | Type | Required | Default | Description | |
| Aora_tol | decimal | 0.05 | Tolerance. It is only used in oracle. | ||
| Arguments | |||||
|---|---|---|---|---|---|
| Name | Type | Required | Unique | Nullable | Description |
| Egeom1 | |||||
| Egeom1 | geometry | ||||
| Egeom2 | |||||
| Egeom2 | geometry | ||||
Example
Copy
<select>
<columns>
<geo.difference ora_tol=''>
<geom1>geometry_col_1</geom1>
<geom2>geometry_col_2</geom2>
</geo.difference>
</columns>
<from table='buildings' alias='a' >
</from>
<where>
a.name = 'MACBA'
</where>
</select>