Available in versions: Dev (3.18) | Latest (3.17) | 3.16

ST_NumGeometries

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

This function returns the number of interior rings of a polygon geometry. For example:

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

The result being, for example

+------------------+
| ST_NumGeometries |
+------------------+
| 4                |
+------------------+

To access the Nth geometry (1-based), use ST_GeometryN.

Dialect support

This example using jOOQ:

stNumGeometries(geometry)

Translates to the following dialect specific expressions:

-- AURORA_MYSQL, AURORA_POSTGRES, COCKROACHDB, MARIADB, MYSQL, POSTGRES, REDSHIFT
st_numgeometries(geometry)

-- ORACLE
sdo_util.getnumelem(geometry)

-- SQLSERVER
geometry.STNumGeometries()

-- 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 3.18, see #10141), or translate your own on our website

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