ST_IsRing

Checks if the LineString is a ring. Returns 1 if the LineString is both closed (start equals end) and simple (no self-intersection).

Syntax

ST_IsRing(g)
IsRing(g)

Description

Returns true if a given LINESTRING is a ring, that is, both ST_IsClosed and ST_IsSimple. A simple curve does not pass through the same point more than once. However, see MDEV-7510.

St_IsRing() and IsRing() are synonyms.

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