ST_PolygonFromEnvelope

Introduction: Construct a Polygon from MinX, MinY, MaxX, MaxY.

Format: ST_PolygonFromEnvelope (MinX:decimal, MinY:decimal, MaxX:decimal, MaxY:decimal)

SELECT ST_PolygonFromEnvelope(double(1.234),double(2.234),double(3.345),double(3.345))

Output:

POLYGON ((1.234 2.234, 1.234 3.345, 3.345 3.345, 3.345 2.234, 1.234 2.234))