[英]Filter MySQL query on difference between timestamp fields
我有一張像這樣的桌子:
RCD_ID ID TIMESTAMP
--------|-----------|---------------------
1, 2737738826, '2015-10-30 16:19:17'
3, 2737738826, '2015-10-30 16:22:46'
4, 2737738826, '2015-10-30 16:24:36'
5, 2737738826, '2015-10-30 16:29:49'
7, 2737738826, '2015-10-30 16:40:02'
9, 2737738826, '2015-10-30 17:11:55'
而且我需要過濾結果集,以便每條記錄彼此之間有20分鍾的“距離”:
RCD_ID ID TIMESTAMP
--------|-----------|---------------------
1, 2737738826, '2015-10-30 16:19:17'
7, 2737738826, '2015-10-30 16:40:02'
9, 2737738826, '2015-10-30 17:11:55'
[ 錯誤的問題:哪種方法是最好的(也是最快的)? ]
正確的問題:有人可以給我一些建議如何開始嗎?
編輯
我在表中添加了一個record_id字段,我嘗試了以下查詢:
select m.*,
(select m2.rcd_id
from tbl_data m2
where (m2.rcd_id > m.rcd_id) AND (TIMESTAMPDIFF(MINUTE, m.log_timestamp, m2.log_timestamp) >= 30)
order by m2.rcd_id limit 1) as m2
from tbl_data as m
但是它返回所有記錄。 我走對了嗎?
謝謝。
可以將表(我使用過“ logs”)連接到表本身,並且只保留那些滿足您時間限制的記錄,例如:
SELECT * FROM logs AS t1, logs AS t2 WHERE t1.ID = t2.ID AND t1.TIMESTAMP != t2.TIMESTAMP AND TIMESTAMPDIFF(MINUTE, t1.TIMESTAMP, t2.TIMESTAMP) = 20
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