ST_X
Syntax
ST_X(p) X(p)
Description
Returns the X-coordinate value for the point p as a double-precision number.
ST_X() and X() are synonyms.
Examples
SET @pt = 'Point(56.7 53.34)'; SELECT X(GeomFromText(@pt)); +----------------------+ | X(GeomFromText(@pt)) | +----------------------+ | 56.7 | +----------------------+
Comments
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ST_X(point) returns a scalar number, not a Geometry type. Do not try to cast it from a WKB to Text or it will return NULL without errors or warnings!
The same is probably true for ST_Y(), ST_Z(), and ST_M().
Example:
MariaDB [db]> select ST_Y(GeomFromText('POINT(-1 1504310400)')); +--------------------------------------------+ | 1504310400 | +--------------------------------------------+ MariaDB [db]> select ST_AsText(ST_Y(GeomFromText('POINT(-1 1504310400)'))); +-------------------------------------------------------+ | NULL | +-------------------------------------------------------+