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ST_NumInteriorRings
Applies to ❌ Open Source Edition ✅ Express Edition ✅ Professional Edition ✅ Enterprise Edition
This function returns the number of interior rings of a polygon geometry. For example:
create.select(stNumInteriorRings(
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_NumInteriorRings | +---------------------+ | 2 | +---------------------+
To access the Nth interior ring (1-based), use ST_InteriorRingN.
Dialect support
This example using jOOQ:
stNumInteriorRings(geometry)
Translates to the following dialect specific expressions:
-- AURORA_MYSQL, AURORA_POSTGRES, COCKROACHDB, MYSQL, POSTGRES, REDSHIFT, SNOWFLAKE
st_numinteriorring(geometry)
-- MARIADB
st_numinteriorrings(geometry)
-- ORACLE
(
SELECT (nullif(
count(*),
0
) - 1)
FROM table(sdo_util.extract_all(geometry))
)
-- SQLSERVER
geometry.STNumInteriorRing()
-- 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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