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ABSENT ON NULL
Supported by ✅ Open Source Edition ✅ Express Edition ✅ Professional Edition ✅ Enterprise Edition
The JSON_ARRAY function has a ABSENT ON NULL clause to indicate that NULL values should not be contained in the output JSON array. Instead, the value should be removed from the array if it is NULL:
SELECT json_array( language.cd, language.description ABSENT ON NULL ) FROM language
create.select(jsonArray(
LANGUAGE.CD,
LANGUAGE.DESCRIPTION)
.absentOnNull())
.from(LANGUAGE)
.fetch();
The result would look like this:
+------------------+ | json_array | +------------------+ | ["EN","English"] | | ["DE"] | +------------------+
Dialect support
This example using jOOQ:
jsonArray(LANGUAGE.CD, LANGUAGE.DESCRIPTION).absentOnNull()
Translates to the following dialect specific expressions:
Aurora Postgres, CockroachDB, Postgres, YugabyteDB
(
SELECT json_agg(t.a)
FROM (
VALUES
(LANGUAGE.CD),
(LANGUAGE.DESCRIPTION)
) t (a)
WHERE t.a IS NOT NULL
)
BigQuery, Spanner
json_strip_nulls(json_array(LANGUAGE.CD, LANGUAGE.DESCRIPTION))
DB2
( SELECT json_array(LANGUAGE.CD, LANGUAGE.DESCRIPTION ABSENT ON NULL) FROM SYSIBM.DUAL )
DuckDB
cast(
array_filter(
ARRAY[
cast(LANGUAGE.CD AS json),
cast(LANGUAGE.DESCRIPTION AS json)
],
e -> e IS NOT NULL
)
AS json
)
H2, Oracle
json_array(LANGUAGE.CD, LANGUAGE.DESCRIPTION ABSENT ON NULL)
MariaDB
coalesce(
(
SELECT json_merge_preserve(
'[]',
concat(
'[',
group_concat(json_extract(value, '$') SEPARATOR ','),
']'
)
)
FROM JSON_TABLE(
json_array(LANGUAGE.CD, LANGUAGE.DESCRIPTION),
'$[*]'
COLUMNS (value json PATH '$')
) t
WHERE (
value <> 'null'
AND rand() IS NOT NULL
)
),
json_array()
)
Snowflake
array_construct_compact(LANGUAGE.CD, LANGUAGE.DESCRIPTION)
SQLite
(
SELECT json_group_array(value) FILTER (WHERE (
value IS NOT NULL
AND key IS NOT NULL
))
FROM json_tree(json_array(LANGUAGE.CD, LANGUAGE.DESCRIPTION))
)
Trino
cast(
filter(
ARRAY[
cast(
cast(LANGUAGE.CD AS varchar)
AS json
),
cast(LANGUAGE.DESCRIPTION AS json)
],
e -> e IS NOT NULL
)
AS json
)
ASE, Access, Aurora MySQL, ClickHouse, Databricks, Exasol, Firebird, HSQLDB, Hana, Informix, MemSQL, MySQL, 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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