[英]PostgreSQL incorrect results when searching by created_at
我有以下查询:
SELECT
COUNT(sr.id) AS total,
COUNT(sr.id) FILTER (where (raw #>> '{survey, declined}' IS NULL) OR (raw #>> '{survey, declined}' = 'false')) AS completed,
COUNT(sr.id) FILTER (WHERE (raw #>> '{survey, declined}' = 'true')) AS denied
FROM survey_results sr
LEFT JOIN clients c ON c.id = sr.client_id
LEFT JOIN facilities f ON f.client_id = c.id
WHERE
sr.created_at >= '2005-07-01T08:00:00+00:00' AND
sr.created_at <= '2005-08-02T07:59:59+00:00' AND
4 IS NULL OR sr.client_id = 4 AND
NULL IS NULL OR f.id = NULL
;
问题是不使用那些created_at过滤器。 它还返回在不同时间创建的记录。 我怎样才能解决这个问题?
您需要括号:
WHERE (sr.created_at >= '2005-07-01T08:00:00+00:00' AND
sr.created_at <= '2005-08-02T07:59:59+00:00'
) AND
(4 IS NULL OR sr.client_id = 4) AND
(NULL IS NULL OR f.id = NULL)
虽然不是必需的,但我会使用带有tz的明确时间戳记来编写tis,并将逻辑简化为:
WHERE (sr.created_at >= '2005-07-01T08:00:00+00:00'::timestamptz AND
sr.created_at < '2005-08-02T08:00:00+00:00'::timestamptz
) AND
(4 IS NULL OR sr.client_id = 4) AND
(NULL IS NULL OR f.id = NULL)
具有多个AND和一个OR可使where子句起作用,您需要将带有括号的子句分组,如下:
SELECT
COUNT(sr.id) AS total,
COUNT(sr.id) FILTER (where (raw #>> '{survey, declined}' IS NULL) OR (raw #>> '{survey, declined}' = 'false')) AS completed,
COUNT(sr.id) FILTER (WHERE (raw #>> '{survey, declined}' = 'true')) AS denied
FROM survey_results sr
LEFT JOIN clients c ON c.id = sr.client_id
LEFT JOIN facilities f ON f.client_id = c.id
WHERE
(sr.created_at >= '2005-07-01T08:00:00+00:00' AND
sr.created_at <= '2005-08-02T07:59:59+00:00' AND
4 IS NULL)
OR
(sr.client_id = 4 AND
NULL IS NULL OR f.id = NULL)
;
删除4 IS NULL
和NULL IS NULL
,并使用方括号:
WHERE (sr.created_at >= '2005-07-01T08:00:00+00:00' AND
sr.created_at <= '2005-08-02T07:59:59+00:00')
AND
(sr.client_id = 4 OR f.id = NULL)
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