This topic describes the ST_union function. This function merges a pcpatch array into a pcpatch object.
Syntax
pcpatch ST_union(pcpatch[] pcs);Parameters
Parameter | Description |
pcs | The pcpatch array. |
Examples
The following statement provides an example on how to calculate the total number of points in a pcpatch object after the pcpatch array is merged.
SELECT ST_NumPoints(ST_Union(pa)) FROM patches;
st_numpoints
--------------
100
(1 row)