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我是mySql的新手。我必須根據星期幾來計算表格中的點擊次數。我怎麼能得到0沒有使用MySQL的記錄?
這裏期限取決於數據庫。但是如果上週沒有記錄,它會發生什麼,它不在列表中。但我需要它作爲0.那麼,我該怎麼做?
SELECT CASE
WHEN PERIOD >= NOW() - INTERVAL 4 WEEK
AND PERIOD < NOW() - INTERVAL 3 WEEK THEN '22-28 days ago'
WHEN PERIOD >= NOW() - INTERVAL 3 WEEK
AND PERIOD < NOW() - INTERVAL 2 WEEK THEN '15-21 days ago'
WHEN PERIOD >= NOW() - INTERVAL 2 WEEK
AND PERIOD < NOW() - INTERVAL 1 WEEK THEN '8-14 days ago'
WHEN PERIOD >= NOW() - INTERVAL 1 WEEK
THEN 'up to 7 days ago'
END WeekPeriod, IFNULL(count(CLICKS),0) TotalClicks
FROM TABLE
WHERE PERIOD >= NOW() - INTERVAL 4 WEEK
GROUP BY CASE
WHEN PERIOD >= NOW() - INTERVAL 4 WEEK
AND PERIOD < NOW() - INTERVAL 3 WEEK THEN '22-28 days ago'
WHEN PERIOD >= NOW() - INTERVAL 3 WEEK
AND PERIOD < NOW() - INTERVAL 2 WEEK THEN '15-21 days ago'
WHEN PERIOD >= NOW() - INTERVAL 2 WEEK
AND PERIOD < NOW() - INTERVAL 1 WEEK THEN '08-14 days ago'
WHEN PERIOD >= NOW() - INTERVAL 1 WEEK
THEN '01 to 7 days ago'
END
ORDER BY WeekPeriod";
答案應該是這樣的
1-7 0
8-15 14
16-21 34
21-28 45
我如何爲過去4個月,而不是過去4個星期做到這一點?嘗試但沒有得到正確的結果。 - – Vadapalli
@BhavaniMalladi用'INTERVAL 4 MONTH'代替'INTERVAL 4 WEEK'' – fancyPants
感謝您的回覆。是的,我試圖逐月替換。我需要按月輸出。像nov,oct,sep,aug – Vadapalli