SELECT HOUR(e.time)as Hour,FLOOR(MINUTE(e.time)/30) as M, COUNT(*) as Count
FROM error_log e
WHERE e.date = '2017-09-02'
GROUP BY FLOOR(MINUTE(e.time)/30),HOUR(e.time)
ORDER BY Hour(e.time);
floor函數是mysql 的向下取整函數 如 floor(1.2) = 1
以下是運行結果:
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原文鏈接:https://blog.csdn.net/qq_28766327/article/details/77864672