Get an element in Json using PostgreSQL

Question

I have this JSON and I want to get this part: '1000000007296871' in SQL

{"pixel_rule":"{\"and\":[{\"event\":{\"eq\":\"Purchase\"}},{\"or\":[{\"content_ids\":{\"i_contains\":\"1000000007296871\"}}]}]}"}

How to do that? this is JSON Dump

Answer 1

Well, you can do this like so:

SELECT
(
    (
        (
            (
                (
                    '{"pixel_rule":"{\"and\":[{\"event\":{\"eq\":\"Purchase\"}},{\"or\":[{\"content_ids\":{\"i_contains\":\"1000000007296871\"}}]}]}"}'::json->>'pixel_rule'
                )::json->>'and'
            )::json->1
        )::json->>'or'
    )::json->0->>'content_ids'
)::json->>'i_contains';

But something is really funny about your input, since it contains json nested in json multiple times.

Answer 2

One option would be smoothing the object by trimming the wrapper quotes of the pixel_rule 's value, and then getting rid of redundant backslashes, and applying json_array_elements function consecutively in order to use #>> operator with the related path to extract the desired value:

SELECT json_array_elements
       (
        json_array_elements(
           replace(trim((jsdata #>'{pixel_rule}')::text,'"'),'\','')::json -> 'and'
        ) -> 'or'
       )::json #>> '{content_ids,i_contains}' AS "Value"
  FROM tab

Demo

Answer 3

my option is using regex '\d+' if other part is not digit

select substring('string' from '\d+')