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

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ST_ExteriorRing

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

This function returns a linestring corresponding to the exterior ring of a polygon geometry. For example:

create.select(stExteriorRing(
  stGeomFromText("""
    POLYGON (
      (-3 -3, 3 -3, 3 3, -3 3, -3 -3),
      (-2 -2, 2 -2, 2 2, -2 2, -2 -2), 
      (-1 -1, 1 -1, 1 1, -1 1, -1 -1)
    )
  """)
)).fetch();

The result being, for example

+--------------------------------------------+
| ST_ExteriorRing                            |
+--------------------------------------------+
| LINESTRING (-3 -3, 3 -3, 3 3, -3 3, -3 -3) |
+--------------------------------------------+

Or, visually:






Dialect support

This example using jOOQ:

stExteriorRing(geometry)

Translates to the following dialect specific expressions:

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

-- ORACLE
sdo_util.extract(geometry, 1, 1)

-- SQLSERVER
geometry.STExteriorRing()

-- 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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