with recursive (non-linear)

Apache DerbyBigQueryDb2 (LUW)H2MariaDBMySQLOracle DBPostgreSQLSQL ServerSQLite2005200720092011201320152017201920213.34.0 - - 3.33.02008R2 - 20228.3 - 1611gR1 - 21c8.0.11 - 8.0.345.0 - 5.710.2 - 10.115.1 - - 2.2.2209.7 - -

Referencing the query_name more than once in the query definition:

WITH RECURSIVE query_name (c) AS (
   VALUES (1)
   SELECT x FROM query_name JOIN base_table
                              ON base_table.x = query_name.c
   SELECT y FROM query_name JOIN base_table
                              ON base_table.y = query_name.c
  FROM query_name

Normative References

The with recursive clause is defined in ISO/IEC 9075-2:2023 §7.17 as part of optional feature T131, “Recursive query” but non-linear recursion is prohibited in ISO/IEC 9075-2:2023 §7.17 SR 3jx.

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