St Xmin

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ST XMIN

Extracts the minimum value of the x coordinates from the supplied geometry. If the geometry is of type geo_point or geo_shape this is equivalent to extracting the minimum longitude value.

FROM airport_city_boundaries
| WHERE abbrev == "CPH"
| EVAL envelope = ST_ENVELOPE(city_boundary)
| EVAL xmin = ST_XMIN(envelope), xmax = ST_XMAX(envelope), ymin = ST_YMIN(envelope), ymax = ST_YMAX(envelope)
| KEEP abbrev, airport, xmin, xmax, ymin, ymax