On Mon, Dec 7, 2020 at 3:22 PM David G. Johnston <david.g.johns...@gmail.com>
wrote:
> On Mon, Dec 7, 2020 at 4:13 PM Steve Baldwin <steve.bald...@gmail.com>
> wrote:
>
>> Try:
>>
>> select _message_body->'Charges'->>'Name' from ...
>>
>
> Not so much..."Charges" is an array so "->>" doesn't do anything useful.
>
> The OP needs to use "json_array_elements" to navigate past the array and
> get to the next layer of the json where ->>'Name' will then work.
>
>
Thank you David. I had tried that function without much luck. But with
your inspiration, I made progress and got to this:
select
_message_exchange_id,jsonb_array_elements(_message_body->'Charges')->>'Name'
FROM message_import_court_case WHERE _message_exchange_id = 1296;
_message_exchange_id | ?column?
----------------------+--------------------------------------------
1296 | Possession Of Burglary Tools
1296 | Burglary In The Second Degree (Commercial)
(2 rows)
But what I really want is one line per message, with the charges in an
array. I can't seem to find the right syntax to make this work:
=> select
_message_exchange_id,array_agg(jsonb_array_elements(_message_body->'Charges')->>'Name')
FROM message_import_court_case WHERE _message_exchange_id = 1296;
ERROR: column "message_import_court_case._message_exchange_id" must appear
in the GROUP BY clause or be used in an aggregate function
LINE 1: select _message_exchange_id,array_agg(jsonb_array_elements(_...
^
=> select
_message_exchange_id,array_agg(jsonb_array_elements(_message_body->'Charges')->>'Name')
FROM message_import_court_case WHERE _message_exchange_id = 1296 GROUP BY 1;
ERROR: set-valued function called in context that cannot accept a set
=> select _message_exchange_id,(SELECT
array_agg(jsonb_array_elements(_message_body->'Charges')->>'Name')) FROM
message_import_court_case WHERE _message_exchange_id = 1296 GROUP BY 1;
ERROR: set-valued function called in context that cannot accept a set
=> select _message_exchange_id,(SELECT
array_agg(jsonb_array_elements(_message_body->'Charges')->>'Name')) FROM
message_import_court_case WHERE _message_exchange_id = 1296;
ERROR: column "message_import_court_case._message_exchange_id" must appear
in the GROUP BY clause or be used in an aggregate function
LINE 1: select _message_exchange_id,(SELECT array_agg(jsonb_array_el...
Thanks!
Ken
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