Re: How to return a jsonb list of lists (with integers)

st 17. 2. 2021 v 16:02 odesílatel Alexander Farber <
alexander(dot)farber(at)gmail(dot)com> napsal:

> I have tried switching to SELECT INTO, but IF FOUND is still always true,
> which gives me [ null, null, null ] for some users:
>
> SELECT JSONB_BUILD_ARRAY(
> SUM(CASE WHEN (player1 = in_viewer AND state1 =
> 'won') OR (player2 = in_viewer AND state2 = 'won') THEN 1 ELSE 0
> END)::integer,
> SUM(CASE WHEN (player1 = in_viewer AND state1 =
> 'lost') OR (player2 = in_viewer AND state2 = 'lost') THEN 1 ELSE 0
> END)::integer,
> SUM(CASE WHEN (player1 = in_viewer AND state1 =
> 'draw') OR (player2 = in_viewer AND state2 = 'draw') THEN 1 ELSE 0
> END)::integer
> )
> FROM words_games
> WHERE finished IS NOT NULL
> AND in_viewer IN (player1, player2)
> AND in_uid IN (player1, player2)
> INTO _versus;
>

It should be true always. The aggregate returns always one row

postgres=# SELECT sum(pocet_muzu) FROM obce WHERE false;
┌─────┐
│ sum │
╞═════╡
│ ∅ │
└─────┘
(1 row)

Regards

Pavel

> IF FOUND THEN -- for some reason this is always
> true
> out_data := JSONB_INSERT(out_data, '{versus}',
> _versus);
> END IF;
>
> What works for me is:
>
> IF _versus <> '[null,null,null]'::jsonb THEN
> out_data := JSONB_INSERT(out_data, '{versus}',
> _versus);
> END IF;
>
> Greetings
> Alex
>
>