If any argument is NULL, the return value is NULL.

If any geometry argument is a valid geometry but not a Point object, an ER_UNEXPECTED_GEOMETRY_TYPE error occurs.

If any geometry argument is not a syntactically well-formed geometry, an ER_GIS_INVALID_DATA error occurs.

If any geometry argument is a syntactically well-formed geometry in an undefined spatial reference system (SRS), an ER_SRS_NOT_FOUND error occurs.

If an X or Y coordinate argument is provided and the value is -inf, +inf, or NaN, an ER_DATA_OUT_OF_RANGE error occurs.

If a longitude or latitude value is out of range, an error occurs:

Ranges shown are in degrees. The exact range limits deviate slightly due to floating-point arithmetic.

Otherwise, the return value is non-NULL.

ST_Latitude(p [, new_latitude_val])

With a single argument representing a valid Point object p that has a geographic spatial reference system (SRS), ST_Latitude() returns the latitude value of p as a double-precision number.

With the optional second argument representing a valid latitude value, ST_Latitude() returns a Point object like the first argument with its latitude equal to the second argument.

ST_Latitude() handles its arguments as described in the introduction to this section, with the addition that if the Point object is valid but does not have a geographic SRS, an ER_SRS_NOT_GEOGRAPHIC error occurs.

mysql> SET @pt = ST_GeomFromText('POINT(45 90)', 4326);
mysql> SELECT ST_Latitude(@pt);
+------------------+
| ST_Latitude(@pt) |
+------------------+
|               45 |
+------------------+
mysql> SELECT ST_AsText(ST_Latitude(@pt, 10));
+---------------------------------+
| ST_AsText(ST_Latitude(@pt, 10)) |
+---------------------------------+
| POINT(10 90)                    |
+---------------------------------+

ST_Longitude(p [, new_longitude_val])

With a single argument representing a valid Point object p that has a geographic spatial reference system (SRS), ST_Longitude() returns the longitude value of p as a double-precision number.

With the optional second argument representing a valid longitude value, ST_Longitude() returns a Point object like the first argument with its longitude equal to the second argument.

ST_Longitude() handles its arguments as described in the introduction to this section, with the addition that if the Point object is valid but does not have a geographic SRS, an ER_SRS_NOT_GEOGRAPHIC error occurs.

mysql> SET @pt = ST_GeomFromText('POINT(45 90)', 4326);
mysql> SELECT ST_Longitude(@pt);
+-------------------+
| ST_Longitude(@pt) |
+-------------------+
|                90 |
+-------------------+
mysql> SELECT ST_AsText(ST_Longitude(@pt, 10));
+----------------------------------+
| ST_AsText(ST_Longitude(@pt, 10)) |
+----------------------------------+
| POINT(45 10)                     |
+----------------------------------+

ST_X(p [, new_x_val])

With a single argument representing a valid Point object p, ST_X() returns the X-coordinate value of p as a double-precision number. The X coordinate is considered to refer to the axis that appears first in the Point spatial reference system (SRS) definition.

With the optional second argument, ST_X() returns a Point object like the first argument with its X coordinate equal to the second argument. If the Point object has a geographic SRS, the second argument must be in the proper range for longitude or latitude values.

ST_X() handles its arguments as described in the introduction to this section.

mysql> SELECT ST_X(Point(56.7, 53.34));
+--------------------------+
| ST_X(Point(56.7, 53.34)) |
+--------------------------+
|                     56.7 |
+--------------------------+
mysql> SELECT ST_AsText(ST_X(Point(56.7, 53.34), 10.5));
+-------------------------------------------+
| ST_AsText(ST_X(Point(56.7, 53.34), 10.5)) |
+-------------------------------------------+
| POINT(10.5 53.34)                         |
+-------------------------------------------+

ST_Y(p [, new_y_val])

With a single argument representing a valid Point object p, ST_Y() returns the Y-coordinate value of p as a double-precision number.The Y coordinate is considered to refer to the axis that appears second in the Point spatial reference system (SRS) definition.

With the optional second argument, ST_Y() returns a Point object like the first argument with its Y coordinate equal to the second argument. If the Point object has a geographic SRS, the second argument must be in the proper range for longitude or latitude values.

ST_Y() handles its arguments as described in the introduction to this section.

mysql> SELECT ST_Y(Point(56.7, 53.34));
+--------------------------+
| ST_Y(Point(56.7, 53.34)) |
+--------------------------+
|                    53.34 |
+--------------------------+
mysql> SELECT ST_AsText(ST_Y(Point(56.7, 53.34), 10.5));
+-------------------------------------------+
| ST_AsText(ST_Y(Point(56.7, 53.34), 10.5)) |
+-------------------------------------------+
| POINT(56.7 10.5)                          |
+-------------------------------------------+