Available in versions: Dev (3.17) | Latest (3.16)

ST_GeometryN

Applies to ❌ Open Source Edition   ✅ Express Edition   ✅ Professional Edition   ✅ Enterprise Edition

This function returns the N-th geometry (1-based) from a geometry that contains multiple nested geometries. For example:

create.select(stGeometryN(stGeomFromText("MULTIPOINT ((-1 -1), (1 -1), (1 1), (-1 1))"), 2)).fetch();

The result being, for example

+--------------+
| ST_GeometryN |
+--------------+
| POINT (1 -1) |
+--------------+

Or, visually:










To get the total number of geometries, use ST_NumGeometries.

Dialect support

This example using jOOQ:

stGeometryN(geometry, 2)

Translates to the following dialect specific expressions:

-- AURORA_MYSQL, AURORA_POSTGRES, COCKROACHDB, MARIADB, MYSQL, ORACLE, POSTGRES, REDSHIFT
st_geometryn(geometry, 2)

-- SQLSERVER
geometry.STGeometryN(2)

-- ACCESS, ASE, BIGQUERY, DB2, DERBY, EXASOL, FIREBIRD, H2, HANA, HSQLDB, INFORMIX, MEMSQL, SNOWFLAKE, SQLDATAWAREHOUSE, 
-- SQLITE, SYBASE, TERADATA, VERTICA, YUGABYTEDB
/* UNSUPPORTED */

(These are currently generated with jOOQ 3.17, see #10141), or translate your own on our website

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