Categories:: Geospatial Functions

ST_XMAX¶

Returns the maximum longitude (X coordinate) of all points contained in its argument.

Syntax¶

ST_XMAX( <geography_expression> )

Arguments¶

geography_expression: The argument must be an expression of type GEOGRAPHY.

Returns¶

Returns a REAL value.

Examples¶

This shows a simple use of the ST_XMIN, ST_XMAX, ST_YMIN, and ST_YMAX functions:

CREATE or replace TABLE extreme_point_collection (g GEOGRAPHY);
INSERT INTO extreme_point_collection (g)
    SELECT TO_GEOGRAPHY('LINESTRING(-180.0 -90.0, -179.9 -89.9, 0 0, +179.9 +89.9, +180.0 +90.0)');

SELECT
    ST_XMIN(g),
    ST_XMAX(g),
    ST_YMIN(g),
    ST_YMAX(g)
  FROM extreme_point_collection;
+------------+------------+------------+------------+
| ST_XMIN(G) | ST_XMAX(G) | ST_YMIN(G) | ST_YMAX(G) |
|------------+------------+------------+------------|
|       -180 |        180 |        -90 |         90 |
+------------+------------+------------+------------+