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

2005200720092011201320152017201910.15.2.0Apache Derby2.0BigQuery11.5Db2 (LUW)1.4.200H210.5.40MariaDB8.0.22MySQL19c1Oracle DB13PostgreSQL2019SQL Server3.33.0SQLite0Use cycle … restrict.1Supported without using ….

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.

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