Can I use… cycle … set … to … default … using

Apache DerbyBigQueryDb2 (LUW)H2MariaDBMySQLOracle DBPostgreSQLSQL ServerSQLite2005200720092011201320152017201910.

The cycle clause can be used to detect cycles in recursive queries based on selected expressions from the row.

WITH RECURSIVE path (from, to) AS (
   SELECT from, to
     FROM edges
    WHERE id = ?
   SELECT from, to
     FROM path
     JOIN edges ON edges.from =
    CYCLE from SET c TO 'Y' DEFAULT 'N' USING path_array
) …

The example detects duplicates based on the value in the from column.

Normative References

The cycle … set … to … default … using clause is defined in ISO/IEC 9075:2016-2 as part of optional feature T131.

About the Author

Photo of Markus Winand

Markus Winand is the SQL Renaissance Ambassador. He is on a mission to introduce developers to the evolution of SQL in the 21st century. Markus can be hired as trainer, speaker and consultant via

Buy his Book on Amazon

Cover of “SQL Performance Explained”: Squirrel running on grass

The essence of SQL tuning in 200 pages

Buy on Amazon
(paperback only)

Paperback and PDF also available at Markus’ store.

Hire Markus

Markus offers SQL training and consulting for developers working at companies of any size.
Learn more »

Connect with Markus Winand

Markus Winand on LinkedInMarkus Winand on XINGMarkus Winand on Twitter
“modern SQL” by Markus Winand is licensed under a Creative Commons Attribution-Noncommercial-No Derivative Works 3.0 Unported License.
Legal | Contact | NO WARRANTY | Trademarks | Privacy and GDPR | CC-BY-NC-ND 3.0 license