Validate and optionally return a geometry. This function checks if a geometry is valid according to OGC rules; it returns the geometry if valid, or NULL if not.
The function checks that a given geometry is compliant with the Well-Known Binary (WKB) format and Spatial Reference System Identifier (SRID) syntax, and is geometrically valid.
It returns the geometry if it's valid, or NULL if not.
The function is useful to filter out invalid geometry data.
A requires both x and y co-ordinates:
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ST_Validate(g)SELECT ST_ASTEXT(ST_VALIDATE(ST_GeomFromText('POINT(1 0)')));
+-------------------------------------------------------+
| ST_ASTEXT(ST_VALIDATE(ST_GeomFromText('POINT(1 0)'))) |
+-------------------------------------------------------+
| POINT(1 0) |
+-------------------------------------------------------+
SELECT ST_ASTEXT(ST_VALIDATE(ST_GeomFromText('POINT(1)')));
+-----------------------------------------------------+
| ST_ASTEXT(ST_VALIDATE(ST_GeomFromText('POINT(1)'))) |
+-----------------------------------------------------+
| NULL |
+-----------------------------------------------------+