我有兩個查詢返回不同的結果,當我期望他們返回相同的結果。MySQL`HAVING`問題
第一個查詢返回正確的結果。 第二個返回結果,但它不正確。
這是爲什麼,我該如何解決第二條語句,以便它返回相同的結果?我必須在本聲明中使用HAVING
條款。
1.
SELECT
CAST(CONCAT(DATE(`mytable`.`starttime`),' ',HOUR(`mytable`.`starttime`),':',LPAD(60*(MINUTE(`mytable`.`starttime`) DIV 60),2,'0'),':00') AS DATETIME) AS `date`,
`mytable`.`id`
FROM
`mytable`
WHERE
`mytable`.`starttime`>='2011-07-01 00:00:00'
AND `mytable`.`starttime`<='2011-07-01 23:59:59'
AND `id` BETWEEN 1 AND 100
GROUP BY
`mytable`.`id`
2.
SELECT
CAST(CONCAT(DATE(`mytable`.`starttime`),' ',HOUR(`mytable`.`starttime`),':',LPAD(60*(MINUTE(`mytable`.`starttime`) DIV 60),2,'0'),':00') AS DATETIME) AS `date`,
`mytable`.`id`
FROM
`mytable`
WHERE
`id` BETWEEN 1 AND 100
GROUP BY
`mytable`.`id`
HAVING `date` IN ('2011-07-01 00:00:00', '2011-07-01 01:00:00', '2011-07-01 02:00:00', '2011-07-01 03:00:00', '2011-07-01 04:00:00', '2011-07-01 05:00:00', '2011-07-01 06:00:00', '2011-07-01 07:00:00', '2011-07-01 08:00:00', '2011-07-01 09:00:00', '2011-07-01 10:00:00', '2011-07-01 11:00:00', '2011-07-01 12:00:00', '2011-07-01 13:00:00', '2011-07-01 14:00:00', '2011-07-01 15:00:00', '2011-07-01 16:00:00', '2011-07-01 17:00:00', '2011-07-01 18:00:00', '2011-07-01 19:00:00', '2011-07-01 20:00:00', '2011-07-01 21:00:00', '2011-07-01 22:00:00', '2011-07-01 23:00:00')
預先感謝您可以提供任何幫助。
是第二個查詢給出較少的結果(因此是錯誤的)..你在日期條件給出了特定的時間,可能會減少結果集。 –