> For the complete documentation index, see [llms.txt](https://mariadb.com/docs/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://mariadb.com/docs/server/reference/sql-statements/geometry-constructors/wkb/st_asbinary.md).

# ST\_AsBinary

## Syntax

```bnf
ST_AsBinary(g)
AsBinary(g)
ST_AsWKB(g)
AsWKB(g)
```

## Description

Converts a value in internal geometry format to its [WKB](/docs/server/reference/sql-statements/geometry-constructors/wkb/well-known-binary-wkb-format.md) representation and returns the binary result.

`ST_AsBinary()`, `AsBinary()`, `ST_AsWKB()` and `AsWKB()` are synonyms,

## Examples

```sql
SET @poly = ST_GeomFromText('POLYGON((0 0,0 1,1 1,1 0,0 0))');
SELECT ST_AsBinary(@poly);

SELECT ST_AsText(ST_GeomFromWKB(ST_AsWKB(@poly)));
+--------------------------------------------+
| ST_AsText(ST_GeomFromWKB(ST_AsWKB(@poly))) |
+--------------------------------------------+
| POLYGON((0 0,0 1,1 1,1 0,0 0))             |
+--------------------------------------------+
```

<sub>*This page is licensed: GPLv2, originally from*</sub> [<sub>*fill\_help\_tables.sql*</sub>](https://github.com/MariaDB/server/blob/main/scripts/fill_help_tables.sql)

{% @marketo/form formId="4316" %}