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NULL ON NULL
Supported by ✅ Open Source Edition ✅ Express Edition ✅ Professional Edition ✅ Enterprise Edition
The JSON_ARRAYAGG function has a NULL ON NULL clause to indicate that NULL values should be included in the output JSON array:
SELECT json_arrayagg( language.description NULL ON NULL ) FROM language
create.select(jsonArrayAgg(
LANGUAGE.DESCRIPTION)
.nullOnNull())
.from(LANGUAGE)
.fetch();
The result would look like this:
+------------------+ | json_arrayagg | +------------------+ | ["English",null] | +------------------+
Dialect support
This example using jOOQ:
jsonArrayAgg(LANGUAGE.DESCRIPTION).nullOnNull()
Translates to the following dialect specific expressions:
Aurora MySQL, H2, Oracle
json_arrayagg(LANGUAGE.DESCRIPTION NULL ON NULL)
Aurora Postgres, CockroachDB, Postgres, YugabyteDB
json_agg(LANGUAGE.DESCRIPTION)
DuckDB
to_json(array_agg(LANGUAGE.DESCRIPTION))
MariaDB, MySQL
json_merge_preserve(
'[]',
concat(
'[',
group_concat(coalesce(
json_quote(LANGUAGE.DESCRIPTION),
'null'
) SEPARATOR ','),
']'
)
)
Snowflake
array_agg(coalesce(
to_variant(LANGUAGE.DESCRIPTION),
parse_json('null')
))
Spanner
to_json(
coalesce(
array_agg(LANGUAGE.DESCRIPTION), cast(ARRAY[] AS array<string>)
)
)
SQLite
json_group_array(LANGUAGE.DESCRIPTION)
SQLServer
json_query(('[' + string_agg(coalesce(
cast(
('"' + replace(LANGUAGE.DESCRIPTION, '"', '\"') + '"')
AS varchar(max)
),
'null'
), ',') + ']'))
Trino
cast(array_agg(LANGUAGE.DESCRIPTION) AS json)
ASE, Access, BigQuery, ClickHouse, DB2, Databricks, Exasol, Firebird, HSQLDB, Hana, Informix, MemSQL, Redshift, SQLDataWarehouse, 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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