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ST_YMin

Introduction: Return the minimum Y coordinate of A

ST_YMin

Format: ST_Y_Min (A:geometry)

Return type: Double

SQL example:

SELECT ST_YMin(ST_GeomFromText('POLYGON((0 0 1, 1 1 1, 1 2 1, 1 1 1, 0 0 1))'))

Output : 0