SELECT DAY(Timestamp), HOUR(Timestamp), MINUTE(Timestamp), AVG(value)
FROM mytable
GROUP BY
DAY(Timestamp), HOUR(Timestamp), MINUTE(Timestamp) WITH ROLLUP
WITH ROLLUP
यहाँ क्लॉज प्रत्येक HOUR
. के लिए औसत के साथ अतिरिक्त पंक्तियाँ उत्पन्न करता है और DAY
, इस तरह:
SELECT DAY(ts), HOUR(ts), MINUTE(ts), COUNT(*)
FROM (
SELECT CAST('2009-06-02 20:00:00' AS DATETIME) AS ts
UNION ALL
SELECT CAST('2009-06-02 20:30:00' AS DATETIME) AS ts
UNION ALL
SELECT CAST('2009-06-02 21:30:00' AS DATETIME) AS ts
UNION ALL
SELECT CAST('2009-06-03 21:30:00' AS DATETIME) AS ts
) q
GROUP BY
DAY(ts), HOUR(ts), MINUTE(ts) WITH ROLLUP
2, 20, 0, 1 2, 20, 30, 1 2, 20, NULL, 2 2, 21, 30, 1 2, 21, NULL, 1 2, NULL, NULL, 3 3, 21, 30, 1 3, 21, NULL, 1 3, NULL, NULL, 1 NULL, NULL, NULL, 4
2, 20, NULL, 2
यहाँ इसका अर्थ है कि COUNT(*)
है 2
DAY = 2
. के लिए , HOUR = 20
और सभी मिनट।