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PRIOR
Applies to ✅ Open Source Edition ✅ Express Edition ✅ Professional Edition ✅ Enterprise Edition
The PRIOR operator allows for specifying an expression from the parent (the "prior") row in the hierarchy. This can be used mainly in the CONNECT BY clause itself.
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:
prior(AUTHOR.ID)
Translates to the following dialect specific expressions:
Exasol, Informix, Oracle, Redshift, Snowflake
PRIOR AUTHOR.ID
ASE, Access, Aurora MySQL, Aurora Postgres, BigQuery, ClickHouse, CockroachDB, DB2, Databricks, Derby, DuckDB, Firebird, H2, HSQLDB, Hana, MariaDB, MemSQL, MySQL, Postgres, 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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