ST_LENGTH

Syntax

ST_LENGTH(ls)

Description

Returns as a double-precision number the length of the LineString value ls in its associated spatial reference.

Examples

SET @ls = 'LineString(1 1,2 2,3 3)';

SELECT ST_LENGTH(ST_GeomFromText(@ls));
+---------------------------------+
| ST_LENGTH(ST_GeomFromText(@ls)) |
+---------------------------------+
|                2.82842712474619 |
+---------------------------------+

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https://mariadb.com/kb/en/st_length/