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XMLAGG
Applies to ✅ Open Source Edition ✅ Express Edition ✅ Professional Edition ✅ Enterprise Edition
A data set can be aggregated into a org.jooq.XML element using XMLAGG
SELECT xmlelement( NAME ids, xmlagg(xmlelement(NAME id, id)) ) FROM author
create.select(xmlelement("ids",
xmlagg(xmlelement("id", AUTHOR.ID))
))
.from(AUTHOR)
.fetch();
The result would look like this:
+---------------------------------+ | xmlelement | +---------------------------------+ | <ids><id>1</id><id>2</id></ids> | +---------------------------------+
Ordering aggregation contents
When aggregating data into XML, ordering may be relevant. For this, use the ORDER BY clause in XMLAGG
SELECT xmlelement( NAME ids, xmlagg(xmlelement(NAME id, id) ORDER BY id DESC) ) FROM author
create.select(xmlelement("ids",
xmlagg(xmlelement("id", AUTHOR.ID))
.orderBy(AUTHOR.ID.desc())))
.from(AUTHOR)
.fetch();
The result would look like this:
+---------------------------------+ | xmlelement | +---------------------------------+ | <ids><id>2</id><id>1</id></ids> | +---------------------------------+
Dialect support
This example using jOOQ:
xmlagg(xmlelement("id", AUTHOR.ID))
Translates to the following dialect specific expressions:
DB2, Oracle, Postgres, Teradata
xmlagg(xmlelement(NAME id, AUTHOR.ID))
ASE, Access, Aurora MySQL, Aurora Postgres, BigQuery, ClickHouse, CockroachDB, Derby, DuckDB, Exasol, Firebird, H2, HSQLDB, Hana, Informix, MariaDB, MemSQL, MySQL, Redshift, SQLDataWarehouse, SQLServer, SQLite, Snowflake, Sybase, Trino, Vertica, YugabyteDB
/* UNSUPPORTED */
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