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SYS_CONNECT_BY_PATH
Applies to ✅ 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, 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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