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.
JSON_OBJECTAGG
Applies to ✅ Open Source Edition ✅ Express Edition ✅ Professional Edition ✅ Enterprise Edition
A data set can be aggregated into a org.jooq.JSON or org.jooq.JSONB object using JSON_OBJECTAGG
SELECT json_objectagg( CAST(author.id AS varchar(100)), first_name ) FROM author
create.select(jsonObjectAgg(
cast(AUTHOR.ID, VARCHAR(100)),
AUTHOR.FIRST_NAME
))
.from(AUTHOR)
.fetch();
The result would look like this:
+----------------------------+
| json_objectagg |
+----------------------------+
| {"1":"George","2":"Paulo"} |
+----------------------------+
NULL handling
Some dialects support the SQL standard NULL ON NULL and ABSENT ON NULL syntax, which allows for including / excluding NULL values from aggregation. By default, SQL aggregate functions always exclude NULL values, but in the context of JSON data types, NULL may have a different significance:
SELECT
json_objectagg(
CAST(author.id AS varchar(100)),
nullif(first_name, 'George')
NULL ON NULL
) AS c1,
json_objectagg(
CAST(author.id AS varchar(100)),
nullif(first_name, 'George')
ABSENT ON NULL
) AS c2
FROM author
create.select(
jsonObjectAgg(
cast(AUTHOR.ID, VARCHAR(100)),
nullif(AUTHOR.FIRST_NAME, "George")
).nullOnNull().as("c1"),
jsonObjectAgg(
cast(AUTHOR.ID, VARCHAR(100)),
nullif(AUTHOR.FIRST_NAME, "George")
).absentOnNull().as("c2")
)
.from(AUTHOR)
.fetch();
The result would look like this:
+------------------------+---------------+
| C1 | C2 |
+------------------------+---------------+
| {"1":null,"2":"Paulo"} | {"2":"Paulo"} |
+------------------------+---------------+
jsonObjectAgg(AUTHOR.FIRST_NAME, AUTHOR.LAST_NAME)
Translates to the following dialect specific expressions:
Aurora Postgres, Postgres, YugabyteDB
json_object_agg(AUTHOR.FIRST_NAME, AUTHOR.LAST_NAME)
BigQuery
json_object( array_agg(AUTHOR.FIRST_NAME), array_agg(AUTHOR.LAST_NAME) )
CockroachDB
(('{' || string_agg(regexp_replace(CAST(json_build_object(AUTHOR.FIRST_NAME, AUTHOR.LAST_NAME) AS string), '^\{(.*)\}$', '\1', 'g'), ',') || '}'))
DB2
(('{' || listagg(
regexp_replace(CAST(json_object(KEY AUTHOR.FIRST_NAME VALUE AUTHOR.LAST_NAME) AS varchar(32672)), '^\{(.*)\}$', '\1'),
','
) || '}'))
DuckDB
to_json(map_from_entries(array_agg(ROW(AUTHOR.FIRST_NAME, AUTHOR.LAST_NAME))))
H2, Oracle
json_objectagg(KEY AUTHOR.FIRST_NAME VALUE AUTHOR.LAST_NAME)
MariaDB, MySQL
json_objectagg(AUTHOR.FIRST_NAME, AUTHOR.LAST_NAME)
Snowflake
object_agg(coalesce(
to_variant(AUTHOR.FIRST_NAME),
parse_json('null')
), coalesce(
to_variant(AUTHOR.LAST_NAME),
parse_json('null')
))
SQLite
json_group_object(AUTHOR.FIRST_NAME, AUTHOR.LAST_NAME)
Trino
cast(map(array_agg(AUTHOR.FIRST_NAME), array_agg(AUTHOR.LAST_NAME)) AS json)
ASE, Access, Aurora MySQL, ClickHouse, Databricks, Derby, Exasol, Firebird, HSQLDB, Hana, Informix, MemSQL, Redshift, SQLDataWarehouse, SQLServer, Sybase, Teradata, Vertica
/* 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!