Re: Counting booleans in GROUP BY sections
Adrian Klaver <[email protected]>
| Newsgroups | gmane.comp.db.postgresql.general |
|---|---|
| Message-ID | <[email protected]> |
On 11/29/19 8:38 AM, Alexander Farber wrote:
> Good evening,
>
> I am trying to count the booleans per each GROUP BY section by the
> following stored function:
>
> CREATE OR REPLACE FUNCTION words_list_puzzles(
> in_start interval,
> in_end interval
>
> ) RETURNS TABLE (
> out_label text,
> out_count bigint,
> out_puzzle boolean,
> out_mid bigint,
> out_secret text,
> out_gid integer,
> out_score integer
> ) AS
> $func$
>
> SELECT
> TO_CHAR(played, 'Mon YYYY') AS label,
> COUNT(NULLIF(puzzle, FALSE)), -- this only returns 0 or 1, why?
If I am following it is because you have mid in GROUP BY and mid is a
PK. Since mid will always be unique you will have at most on row per group.
> puzzle,
> mid,
> MD5(mid || ‘my little secret’) AS secret,
> gid,
> score
>
> FROM words_moves
> WHERE action = 'play'
> AND LENGTH(hand) = 7
> AND (LENGTH(letters) = 7 OR score > 90)
> AND played > CURRENT_TIMESTAMP - in_start
> AND played < CURRENT_TIMESTAMP - in_end
> GROUP BY label, puzzle, mid, secret, gid, score
> ORDER BY played DESC
>
> $func$ LANGUAGE sql STABLE;
>
> But when I run it, I only get 0 or 1 in the out_count column:
>
> words_ru=> select * from words_list_puzzles(interval '2 year', interval
> '1 year');
> out_label | out_count | out_puzzle | out_mid | out_secret
> | out_gid | out_score
> -----------+-----------+------------+---------+----------------------------------+---------+-----------
> Nov 2018 | 0 | f | 1326876 |
> e4928d3c34f50b8e6eabf7bad5b932fe | 46007 | 28
> Nov 2018 | 0 | f | 1324466 |
> 6228ba509a7124f485feb5c1acbb6b68 | 45922 | 26
> Nov 2018 | 0 | f | 1322050 |
> b67b091d383678de392bf7370c735cab | 45877 | 34
> Nov 2018 | 0 | f | 1320017 |
> 35f03b0c7159cec070c00aa80359fd42 | 44255 | 120
> Nov 2018 | 0 | f | 1319160 |
> 83df42f7ad398bbb060fc02ddfdc62c0 | 45031 | 95
> .....
> May 2018 | 0 | f | 264251 |
> 2fff1154962966b16a2996387e30ae7f | 10946 | 99
> May 2018 | 1 | t | 257620 |
> 645613db6ea40695dc967d8090ab3246 | 12713 | 93
> May 2018 | 0 | f | 245792 |
> bb75bfd9cb443ff541b199d893c68117 | 12359 | 24
> May 2018 | 1 | t | 243265 |
> d899a5d642ccd96d931194f48ef56d53 | 11950 | 123
> May 2018 | 0 | f | 231953 |
> ad53b5b2c0d4cced3d50e8b44ad53e55 | 11910 | 32
>
> - while I was hoping to get 2 for the "May 2018" section.
>
> What am I doing wrong please, why don't the values add up? Below is the
> table desc:
>
> words_ru=> \d words_moves
> Table "public.words_moves"
> Column | Type | Collation | Nullable |
> Default
> ---------+--------------------------+-----------+----------+------------------------------------------
> mid | bigint | | not null |
> nextval('words_moves_mid_seq'::regclass)
> action | text | | not null |
> gid | integer | | not null |
> uid | integer | | not null |
> played | timestamp with time zone | | not null |
> tiles | jsonb | | |
> score | integer | | |
> letters | text | | |
> hand | text | | |
> puzzle | boolean | | not null | false
> Indexes:
> "words_moves_pkey" PRIMARY KEY, btree (mid)
> "words_moves_gid_played_idx" btree (gid, played DESC)
> "words_moves_uid_action_played_idx" btree (uid, action, played)
> "words_moves_uid_idx" btree (uid)
> Check constraints:
> "words_moves_score_check" CHECK (score >= 0)
> Foreign-key constraints:
> "words_moves_gid_fkey" FOREIGN KEY (gid) REFERENCES
> words_games(gid) ON DELETE CASCADE
> "words_moves_uid_fkey" FOREIGN KEY (uid) REFERENCES
> words_users(uid) ON DELETE CASCADE
> Referenced by:
> TABLE "words_scores" CONSTRAINT "words_scores_mid_fkey" FOREIGN KEY
> (mid) REFERENCES words_moves(mid) ON DELETE CASCADE
>
> Thank you
> Alex
>
--
Adrian Klaver
[email protected]