ST_POINTN

Returns the N-th Point in a LineString. This function retrieves a specific point from the sequence based on its 1-based index.

Syntax

ST_PointN(ls,N)
PointN(ls,N)

Description

Returns the N-th Point in the LineString value ls. Points are numbered beginning with 1.

ST_PointN() and PointN() are synonyms.

Examples

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

SELECT AsText(PointN(GeomFromText(@ls),2));
+-------------------------------------+
| AsText(PointN(GeomFromText(@ls),2)) |
+-------------------------------------+
| POINT(2 2)                          |
+-------------------------------------+

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