ST_IsClosed
Applies to ❌ Open Source Edition ✅ Express Edition ✅ Professional Edition ✅ Enterprise Edition
This predicate checks if a linestring has the same start point and end point.
create.select(
stIsClosed(stGeomFromText("LINESTRING (-3 -1, -1 -1, -3 1, -3 -1)")),
stIsClosed(stGeomFromText("LINESTRING (3 1, 1 1, 3 -1)"))
).fetch();
The result being, for example
+-------------+-------------+ | ST_IsClosed | ST_IsClosed | +-------------+-------------+ | true | false | +-------------+-------------+
Or, visually:
Dialect support
This example using jOOQ:
stIsClosed(geometry)
Translates to the following dialect specific expressions:
Aurora MySQL, Aurora Postgres, CockroachDB, DuckDB, MariaDB, MySQL, Postgres, Redshift, Snowflake
st_isclosed(geometry)
Oracle
(sdo_relate(sdo_lrs.geom_segment_start_pt(geometry), sdo_lrs.geom_segment_end_pt(geometry), 'mask=EQUAL'))
SQLServer
geometry.STIsClosed() = 1
ASE, Access, BigQuery, ClickHouse, DB2, Derby, Exasol, Firebird, H2, HSQLDB, Hana, Informix, MemSQL, SQLDataWarehouse, SQLite, Sybase, Teradata, Trino, Vertica, YugabyteDB
/* UNSUPPORTED */
Generated with jOOQ 3.20. Translate your own SQL on our website
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