Mysql Group 24 घंटे के अंतराल तक

इसे आजमाएं:

SELECT MIN(creation_date), MAX(creation_date), COUNT(*) AS Occurrences 
FROM test
GROUP BY DATE(DATE_SUB(creation_date, INTERVAL 19 HOUR))

वर्किंग डेमो:http://sqlfiddle.com/#!2/aa7583/6

फ़ॉर्मेटिंग भाग के लिए, इसका उपयोग करें:

SELECT CONCAT( CONCAT(DATE(DATE_SUB(creation_date, INTERVAL 19 HOUR)),' 19:00:00') , ' - ' , CONCAT(DATE(DATE_ADD(creation_date, INTERVAL 5 HOUR)), ' 18:59:00') ) AS Interval, COUNT(*) AS Occurrences 
FROM test
GROUP BY DATE(DATE_SUB(creation_date, INTERVAL 19 HOUR))