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

ST_Touches

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

This predicate checks if two geometries touch. For example:

create.select(
  field(stTouches(
    stGeomFromText("LINESTRING (-1 0, -1 1, -2 1, -2 2)"), 
    stGeomFromText("LINESTRING (-1 1, -2 0)")
  )),
  field(stTouches(
    stGeomFromText("LINESTRING (1 0, 1 1, 2 1, 2 2)"), 
    stGeomFromText("LINESTRING (1 2, 0 1)")
  ))
).fetch();

The result being, for example

+------------+------------+
| ST_Touches | ST_Touches |
+------------+------------+
| true       | false      |
+------------+------------+

Or, visually:










Dialect support

This example using jOOQ:

stTouches(geometry1, geometry2)

Translates to the following dialect specific expressions:

-- AURORA_MYSQL, AURORA_POSTGRES, COCKROACHDB, MARIADB, MYSQL, POSTGRES, REDSHIFT
st_touches(geometry1, geometry2)

-- ORACLE
((st_touch(geometry1, geometry2) = 'TRUE'))

-- SQLSERVER
geometry1.STTouches(geometry2) = 1

-- 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 3.18, see #10141), or translate your own on our website

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