# ST\_Validate

{% hint style="info" %}
ST\_Validate is available from [MariaDB 12.0](https://app.gitbook.com/s/aEnK0ZXmUbJzqQrTjFyb/community-server/release-notes-mariadb-12.0-rolling-releases/what-is-mariadb-120).
{% endhint %}

## Syntax

```sql
ST_Validate(g)
```

## Description

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.

## Examples

A [POINT](https://mariadb.com/docs/server/reference/sql-statements/geometry-constructors/geometry-constructors/point) requires both x and y co-ordinates:

```sql
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                                                |
+-----------------------------------------------------+
```

## See Also

* [Geometry Constructors](https://mariadb.com/docs/server/reference/sql-statements/geometry-constructors)
* [ST\_AsText](https://mariadb.com/docs/server/reference/sql-statements/geometry-constructors/wkt/st_astext)

<sub>*This page is licensed: CC BY-SA / Gnu FDL*</sub>

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