NULL ON NULL
Supported by ✅ Open Source Edition ✅ Express Edition ✅ Professional Edition ✅ Enterprise Edition
The JSON_OBJECTAGG function has a NULL ON NULL clause to indicate that NULL values should be included in the output JSON document:
SELECT json_objectagg( language.cd, language.description NULL ON NULL ) FROM language
create.select(jsonObject(
LANGUAGE.CD, LANGUAGE.DESCRIPTION)
.nullOnNull())
.from(LANGUAGE)
.fetch();
The result would look like this:
+----------------------------+
| json_objectagg |
+----------------------------+
| {"EN":"English","DE":null} |
+----------------------------+
Dialect support
This example using jOOQ:
jsonObjectAgg(LANGUAGE.CD, LANGUAGE.DESCRIPTION).nullOnNull()
Translates to the following dialect specific expressions:
Aurora Postgres, Postgres, YugabyteDB
json_object_agg(LANGUAGE.CD, LANGUAGE.DESCRIPTION)
BigQuery, Spanner
json_object( array_agg(LANGUAGE.CD), array_agg(LANGUAGE.DESCRIPTION) )
CockroachDB
(('{' || string_agg(regexp_replace(cast(
json_build_object(LANGUAGE.CD, LANGUAGE.DESCRIPTION)
AS string
), '^\{(.*)\}$', '\1', 'g'), ',') || '}'))
DB2
(('{' || listagg(
regexp_replace(cast(
json_object(KEY LANGUAGE.CD VALUE LANGUAGE.DESCRIPTION)
AS varchar(32672)
), '^\{(.*)\}$', '\1'),
','
) || '}'))
DuckDB
to_json(map_from_entries(array_agg(ROW(LANGUAGE.CD, LANGUAGE.DESCRIPTION))))
H2, Oracle
json_objectagg(KEY LANGUAGE.CD VALUE LANGUAGE.DESCRIPTION NULL ON NULL)
MariaDB, MySQL
json_objectagg(LANGUAGE.CD, LANGUAGE.DESCRIPTION)
Snowflake
object_agg(coalesce(
to_variant(LANGUAGE.CD),
parse_json('null')
), coalesce(
to_variant(LANGUAGE.DESCRIPTION),
parse_json('null')
))
SQLite
json_group_object(LANGUAGE.CD, LANGUAGE.DESCRIPTION)
Trino
cast(map(array_agg(cast(LANGUAGE.CD AS varchar)), array_agg(LANGUAGE.DESCRIPTION)) AS json)
ASE, Access, Aurora MySQL, ClickHouse, Databricks, 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
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