Available in versions: Dev (3.21) | Latest (3.20) | 3.19 | 3.18 | 3.17 | 3.16 | 3.15 | 3.14 | 3.13 | 3.12

NULL ON NULL

Supported by ✅ Open Source Edition ✅ Express Edition ✅ Professional Edition ✅ Enterprise Edition

The JSON_ARRAY function has a NULL ON NULL clause to indicate that NULL values be included in the output JSON array:

SELECT json_array(
  language.cd, language.description
  NULL ON NULL
)
FROM language

create.select(jsonArray(
          LANGUAGE.CD, LANGUAGE.DESCRIPTION)
          .nullOnNull())
      .from(LANGUAGE)
      .fetch();

The result would look like this:

+------------------+
| json_array       |
+------------------+
| ["EN","English"] |
| ["DE", null]     |
+------------------+

Dialect support

This example using jOOQ:

jsonArray(LANGUAGE.CD, LANGUAGE.DESCRIPTION).nullOnNull()

Translates to the following dialect specific expressions:

json_build_array(LANGUAGE.CD, LANGUAGE.DESCRIPTION)

json_array(LANGUAGE.CD, LANGUAGE.DESCRIPTION)

toJSONString(tuple(LANGUAGE.CD, LANGUAGE.DESCRIPTION))

(
  SELECT json_array(LANGUAGE.CD, LANGUAGE.DESCRIPTION NULL ON NULL)
  FROM SYSIBM.DUAL
)

json_array(LANGUAGE.CD, LANGUAGE.DESCRIPTION NULL ON NULL)

array_construct(coalesce(
  to_variant(LANGUAGE.CD),
  parse_json('null')
), coalesce(
  to_variant(LANGUAGE.DESCRIPTION),
  parse_json('null')
))

cast(
  ARRAY[
    cast(
      cast(LANGUAGE.CD AS varchar)
      AS json
    ),
    cast(LANGUAGE.DESCRIPTION AS json)
  ]
  AS json
)

/* UNSUPPORTED */

Generated with jOOQ 3.21. Support in older jOOQ versions may differ. Translate your own SQL on our website

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