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This documentation is for the unreleased development version of jOOQ. Click on the above version links to get this documentation for a supported version of jOOQ.
CONNECT_BY_ROOT
Applies to ✅ Open Source Edition ✅ Express Edition ✅ Professional Edition ✅ Enterprise Edition
The CONNECT_BY_ROOT operator allows for accessing a row's hierarchy root row and evaluate an expression on that root row.
SELECT
child,
parent,
sys_connect_by_path(child, '/'),
connectByRoot(child)
FROM (
VALUES
(1, null),
(2, 1),
(3, null),
(4, 3)
) AS t (child, parent)
START WITH
parent IS NULL
CONNECT BY NOCYCLE
PRIOR child = parent;
Field<Integer> child = field("child", INTEGER);
Field<Integer> parent = field("parent", INTEGER);
create.select(
child,
parent,
sysConnectByPath(child, "/"),
connectByRoot(child))
.from(values(
row(val(1), val(null, INTEGER)),
row(2, 1),
row(val(3), val(null, INTEGER)),
row(4, 3)).as(table("t"), child, parent))
.startWith(parent.isNull())
.connectByNoCycle(prior(child).eq(parent))
.fetch();
The result being, for example
+-------+--------+---------------------+-----------------+
| child | parent | sys_connect_by_path | connect_by_root |
+-------+--------+---------------------+-----------------+
| 1 | {null} | /1 | 1 |
| 2 | 1 | /1/2 | 1 |
| 3 | {null} | /3 | 3 |
| 4 | 3 | /3/4 | 3 |
+-------+--------+---------------------+-----------------+
Dialect support
This example using jOOQ:
connectByRoot(AUTHOR.ID)
Translates to the following dialect specific expressions:
Exasol, Informix, Oracle, Snowflake
connect_by_root AUTHOR.ID
ASE, Access, Aurora MySQL, Aurora Postgres, BigQuery, ClickHouse, CockroachDB, DB2, Databricks, Derby, DuckDB, Firebird, H2, HSQLDB, Hana, MariaDB, MemSQL, MySQL, Postgres, Redshift, SQLDataWarehouse, SQLServer, SQLite, Sybase, Teradata, Trino, Vertica, YugabyteDB
/* UNSUPPORTED */
Generated with jOOQ 3.21. Support in older jOOQ versions may differ. Translate your own SQL on our website
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