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ST_POINTN
Database: MySQL
Topic
ST_PointN(ls, N)
Returns the N-th Point in the Linestring value ls. Points are numbered
beginning with 1.
ST_PointN() handles its arguments as described in the introduction to
this section.
URL: https://dev.mysql.com/doc/refman/8.0/en/gis-linestring-property-functions.html
Example
mysql> SET @ls = 'LineString(1 1,2 2,3 3)';
mysql> SELECT ST_AsText(ST_PointN(ST_GeomFromText(@ls),2));
+----------------------------------------------+
| ST_AsText(ST_PointN(ST_GeomFromText(@ls),2)) |
+----------------------------------------------+
| POINT(2 2) |
+----------------------------------------------+
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