Question

我正在尝试编写一个查询，选择所有＆＃34;引导＆＃34;，并按当天的每小时计数对它们进行分组。

示例：

lead 1: created today, 08.30
lead 2: created today, 09.30
lead 3: created today, 09.40

我需要一个结果，例如：

小时：0，领先0

小时：1，领先0

...

小时：8，领导1

小时：9，领先2

小时：10，领先0

从一开始就需要，这就是我所拥有的，但它返回的结果不正确。

SELECT HOUR(created) AS `HOUR`, COUNT(*)
FROM lead
WHERE created >= CURDATE() - INTERVAL 1 DAY
GROUP BY HOUR(created)

我正在使用symfony，所以使用DQL这样做也很好。

非常感谢任何帮助！

Answer 1

使用此

SELECT hrs.h AS `HOUR`, IFNULL(l.cnt, 0) AS lead_count FROM
(SELECT 0 AS h UNION ALL SELECT 1 AS h UNION ALL SELECT 2 AS h UNION ALL SELECT 3 AS h UNION ALL SELECT 4 AS h UNION ALL SELECT 5 AS h UNION ALL SELECT 6 AS h UNION ALL SELECT 7 AS h UNION ALL SELECT 8 AS h UNION ALL SELECT 9 AS h UNION ALL SELECT 10 AS h UNION ALL SELECT 11 AS h UNION ALL SELECT 12 AS h UNION ALL SELECT 13 AS h UNION ALL SELECT 14 AS h UNION ALL SELECT 15 AS h UNION ALL SELECT 16 AS h UNION ALL SELECT 17 AS h UNION ALL SELECT 18 AS h UNION ALL SELECT 19 AS h UNION ALL SELECT 20 AS h UNION ALL SELECT 21 AS h UNION ALL SELECT 22 AS h UNION ALL SELECT 23 AS h UNION ALL SELECT 24 AS h) hrs
LEFT OUTER JOIN
(SELECT HOUR(created) AS h, COUNT(*) AS cnt FROM lead WHERE created >= CONCAT(CURDATE(), ' 00:00:00') GROUP BY 1) l ON l.h = hrs.h

SQL或DQL，从一开始就按计数分组，直到现在

1 个答案: