ST_AddPoint

Introduction: RETURN Linestring with additional point at the given index, if position is not available the point will be added at the end of line.

Format: ST_AddPoint(geom: geometry, point: geometry, position: integer)

Format: ST_AddPoint(geom: geometry, point: geometry)

SQL example:

SELECT ST_AddPoint(ST_GeomFromText('LINESTRING(0 0, 1 1, 1 0)'), ST_GeomFromText('Point(21 52)'), 1)

SELECT ST_AddPoint(ST_GeomFromText('Linestring(0 0, 1 1, 1 0)'), ST_GeomFromText('Point(21 52)'))

Output:

LINESTRING(0 0, 21 52, 1 1, 1 0)
LINESTRING(0 0, 1 1, 1 0, 21 52)