Available in versions: Dev (3.20) | Latest (3.19) | 3.18 | 3.17 | 3.16

ST_Union

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

This function combines a geometry with another. For example:

create.select(stUnion(
  stGeomFromText("POLYGON ((-1 -1, 1 -1, 1 1, -1 1, -1 -1))"),
  stGeomFromText("POLYGON ((0 0, 2 0, 2 2, 0 2, 0 0))"),
)).fetch();

The result being, for example

+--------------------------------------------------------------+
| ST_Union                                                     |
+--------------------------------------------------------------+
| POLYGON ((1 -1, -1 -1, -1 1, 0 1, 0 2, 2 2, 2 0, 1 0, 1 -1)) |
+--------------------------------------------------------------+

Or, visually:








Dialect support

This example using jOOQ:

stUnion(geometry1, geometry2)

Translates to the following dialect specific expressions:

Aurora MySQL, Aurora Postgres, MariaDB, MySQL, Postgres, Redshift, Snowflake

st_union(geometry1, geometry2)

CockroachDB

(
  SELECT st_union(v)
  FROM (
    VALUES
      (geometry1),
      (geometry2)
  ) t (v)
)

Oracle

sdo_geom.sdo_union(geometry1, geometry2, tol => null)

SQLServer

geometry1.STUnion(geometry2)

ASE, Access, BigQuery, ClickHouse, DB2, Derby, DuckDB, Exasol, Firebird, H2, HSQLDB, Hana, Informix, MemSQL, SQLDataWarehouse, SQLite, Sybase, Teradata, Trino, Vertica, YugabyteDB

/* UNSUPPORTED */

(These are currently generated with jOOQ 3.20, see #10141), or translate your own on our website

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