Available in versions: Dev (3.21) | Latest (3.20) | 3.19 | 3.18 | 3.17 | 3.16 | 3.15 | 3.14 | 3.13 | 3.12 | 3.11
SYS_CONNECT_BY_PATH
Supported by ✅ Open Source Edition ✅ Express Edition ✅ Professional Edition ✅ Enterprise Edition
The SYS_CONNECT_BY_PATH function allows for recursively generating a string for each element in the path leading to the current row in the hierarchy.
SELECT
child,
parent,
sys_connect_by_path(child, '/')
FROM (
VALUES
(1, null),
(2, 1),
(3, 2)
) 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);
ctx.select(
child,
parent,
sysConnectByPath(child, "/"))
.from(values(
row(val(1), val(null, INTEGER)),
row(2, 1),
row(3, 2)).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 |
+-------+--------+---------------------+
| 1 | {null} | /1 |
| 2 | 1 | /1/2 |
| 3 | 2 | /1/2/3 |
+-------+--------+---------------------+
Dialect support
This example using jOOQ:
sysConnectByPath(AUTHOR.ID, "/")
Translates to the following dialect specific expressions:
Exasol, Informix, Oracle, Snowflake
sys_connect_by_path(AUTHOR.ID, '/')
ASE, Access, Aurora MySQL, Aurora Postgres, BigQuery, ClickHouse, CockroachDB, DB2, Databricks, DuckDB, Firebird, H2, HSQLDB, Hana, MariaDB, MemSQL, MySQL, Postgres, Redshift, SQLDataWarehouse, SQLServer, SQLite, Spanner, 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
Feedback
Do you have any feedback about this page? We'd love to hear it!