# ST_MPointFromWKB

## Definition

ST_MPointFromText takes a well-known binary (WKB) representation of type ST_MultiPoint and a spatial reference ID and creates an ST_MultiPoint.

## Syntax

**Oracle**

sde.st_mpointfromwkb (wkb blob, srid integer)

**PostgreSQL**

sde.st_mpointfromwkb (wkb bytea, srid integer)

## Return type

ST_MultiPoint

## Example

In the following example, the lines of results have been reformatted for readability. The spacing in your results will vary according to your online display. This example illustrates how ST_MPointFromWKB can be used to create a multipoint from its well-known binary representation. The geometry is a multipoint in spatial reference system 1. In this example, the multipoint gets stored with ID = 10 in the GEOMETRY column of the SAMPLE_MPOINTS table, then the WKB column is updated with its well-known binary representation (using the ST_AsBinary function). Finally, the ST_MPointFromWKB function is used to return the multipoint from the WKB column. The x- and y-coordinates for this geometry are (44, 14) (35, 16) (24, 13). The SAMPLE_MPOINTS table has a GEOMETRY column, where the multipoint is stored, and a WKB column, where the multipoint's well-known binary representation is stored.

**Oracle**

CREATE TABLE sample_mpoints (id integer, geometry sde.st_geometry, wkb blob); INSERT INTO SAMPLE_MPOINTS (id, geometry) VALUES ( 10, sde.st_multipoint ('multipoint (4 14, 35 16, 24 13)', 0) ); UPDATE SAMPLE_MPOINTS SET wkb = sde.st_asbinary (geometry) WHERE id = 10;

**PostgreSQL**

CREATE TABLE sample_mpoints (id integer, geometry sde.st_geometry, wkb bytea); INSERT INTO sample_mpoints (id, geometry) VALUES ( 10, sde.st_multipoint ('multipoint (4 14, 35 16, 24 13)', 0) ); UPDATE sample_mpoints SET wkb = sde.st_asbinary (geometry) WHERE id = 10;

In the following SELECT statement, the ST_MPointFromWKB function is used to retrieve the multipoint from the WKB column.

**Oracle**

SELECT id, sde.st_astext (sde.st_mpointfromwkb (wkb,0)) MULTI_POINT FROM SAMPLE_MPOINTS WHERE id = 10; ID MULTI_POINT 10 MULTIPOINT (4.00000000 14.00000000, 35.00000000 16.00000000 24.00000000 13.00000000)

**PostgreSQL**

SELECT id, sde.st_astext (sde.st_mpointfromwkb (wkb,0)) AS "MULTI_POINT" FROM sample_mpoints WHERE id = 10; id MULTI_POINT 10 MULTIPOINT (4 14, 35 16, 24 13)