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, Snowflake
st_geometryn(geometry, 2)
SQLServer
geometry.STGeometryN(2)
ASE, Access, BigQuery, ClickHouse, DB2, Derby, DuckDB, Exasol, Firebird, H2, HSQLDB, Hana, Informix, MemSQL, SQLDataWarehouse, SQLite, Sybase, Teradata, Trino, Vertica, YugabyteDB
/* UNSUPPORTED */
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