Categories:

Geospatial Functions

ST_ASWKT , ST_ASTEXT

Given a value of type GEOGRAPHY, return the text (VARCHAR) representation of that value in WKT (well-known text) format.

See also:

ST_ASEWKT

Syntax

Use one of the following:

ST_ASWKT( <geography_expression> )

ST_ASTEXT( <geography_expression> )

Arguments

geography_expression

The argument must be an expression of type GEOGRAPHY.

Returns

A VARCHAR.

Usage Notes

  • ST_ASTEXT is an alias for ST_ASWKT.

  • To return the output in EWKT format, use ST_ASEWKT instead.

Examples

The following example demonstrates the ST_ASWKT function:

create table geospatial_table (g GEOGRAPHY);
insert into geospatial_table values
    ('POINT(-122.35 37.55)'), ('LINESTRING(-124.20 42.00, -120.01 41.99)');
select st_astext(g)
    from geospatial_table;
+-------------------------------------+
| ST_ASTEXT(G)                        |
|-------------------------------------|
| POINT(-122.35 37.55)                |
| LINESTRING(-124.2 42,-120.01 41.99) |
+-------------------------------------+
select st_aswkt(g)
    from geospatial_table;
+-------------------------------------+
| ST_ASWKT(G)                         |
|-------------------------------------|
| POINT(-122.35 37.55)                |
| LINESTRING(-124.2 42,-120.01 41.99) |
+-------------------------------------+