CODEWITHSUNDEEP
sqljsonpostgresqlkeyjsonb
Marco Di Falco
Marco Di Falco

Reputation: 59

Get keys into JSON field in postgres

I have this Json in a column af type jsonb in Postgres

{
    "coreTimes": {
        "TMP_CLINICAL_TIMES_ANESTHESIOLOGY_OUT_DATETIME": {
            "value": 1
        },
        "TMP_CLINICAL_TIMES_ANESTHESIOLOGY_IN_DATETIME": {
            "value": 2
        },
        "TMP_CLINICAL_TIMES_SURGICAL_OUT_DATETIME": {
            "value": 3
        },
        "TMP_CLINICAL_TIMES_ROOM_IN_DATETIME": {
            "value": 4
        },
        "TMP_CLINICAL_TIMES_ROOM_OUT_DATETIME": {
            "value": null
        },
        "TMP_CLINICAL_TIMES_BLOCK_OUT_DATETIME": {
            "value": null
        },
        "TMP_CLINICAL_TIMES_BLOCK_IN_DATETIME": {
            "value": null
        },
        "TMP_CLINICAL_TIMES_SURGICAL_IN_DATETIME": {
            "value": null
        }
    }
}

I need this result:

Column
{"value":1}
{"value":2}
{"value":3}
{"value":4}
{"value":null}
{"value":null}
{"value":null}

What postgres function can i use to get this result if json properties can change dynamically (the key 'coreTimes' is fixed)?

In oracle i have resolved 

 SELECT res.*
 FROM sopinterventionsaux   ,
      JSON_TABLE ( operating_times, '$.coreTimes.*'
           COLUMNS (
              value VARCHAR2 ( 2000 ) FORMAT JSON PATH '$'
                    )
                ) res

Upvotes: 2

Views: 79

Answers (1)

Dmitry
Dmitry

Reputation: 3780

The following works in PostgreSQL 12 which supports JSON path query

WITH T AS (SELECT $$
{
    "coreTimes": {
        "TMP_CLINICAL_TIMES_ANESTHESIOLOGY_OUT_DATETIME": {
            "value": 1
        },
        "TMP_CLINICAL_TIMES_ANESTHESIOLOGY_IN_DATETIME": {
            "value": 2
        },
        "TMP_CLINICAL_TIMES_SURGICAL_OUT_DATETIME": {
            "value": 3
        },
        "TMP_CLINICAL_TIMES_ROOM_IN_DATETIME": {
            "value": 4
        },
        "TMP_CLINICAL_TIMES_ROOM_OUT_DATETIME": {
            "value": null
        },
        "TMP_CLINICAL_TIMES_BLOCK_OUT_DATETIME": {
            "value": null
        },
        "TMP_CLINICAL_TIMES_BLOCK_IN_DATETIME": {
            "value": null
        },
        "TMP_CLINICAL_TIMES_SURGICAL_IN_DATETIME": {
            "value": null
        }
    }
}
$$::JSONB)
SELECT jsonb_path_query(jsonb, '$.coreTimes.*') FROM T;

 jsonb_path_query 
------------------
 {"value": 4}
 {"value": null}
 {"value": null}
 {"value": null}
 {"value": null}
 {"value": 3}
 {"value": 2}
 {"value": 1}
(8 rows)

Upvotes: 2

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