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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)
-- ACCESS, ASE, BIGQUERY, DB2, DERBY, DUCKDB, EXASOL, FIREBIRD, H2, HANA, HSQLDB, INFORMIX, MEMSQL, SQLDATAWAREHOUSE,
-- SQLITE, SYBASE, TERADATA, TRINO, VERTICA, YUGABYTEDB
/* UNSUPPORTED */
(These are currently generated with jOOQ 3.19, see #10141), or translate your own on our website
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