在以下查詢中包含來自週數的日期

Question

我有以下SQL查詢返回大多數問題被回答的前五週。這個星期正在被數字返回，但我想要一週的第一個日期而不是數字。

SELECT Count(*) AS answered, 
    Week(score_datetime) AS week, 
    Year(score_datetime) AS year 
FROM development.score 
WHERE score_datetime IS NOT NULL 
GROUP BY Week(score_datetime) 
ORDER BY answered DESC 
LIMIT 5; 

我的SQL技能是不是最好的，所以我現在得到時momentjs返回從週數的日期。因此，如果有人知道我可以如何在上面的查詢中包含日期以及週數和年份，那麼將非常感激。

Answer 1

試着這麼做這個：

SELECT Count(*) AS answered, 
    Week(score_datetime) AS week, 
    DATE_ADD(score_datetime, INTERVAL(1-DAYOFWEEK(score_datetime)) DAY) as week_start, 
    Year(score_datetime) AS year 
FROM development.score 
WHERE score_datetime IS NOT NULL 
GROUP BY Week(score_datetime) 
ORDER BY answered DESC 
LIMIT 5; 

Answer 2

回答你的具體問題，可以發現：How to convert number of week into date?

因此，基於答案的轉換公式爲：WEEKDAY(DATE_ADD(MAKEDATE(year, 1), INTERVAL Week(score_datetime) WEEK))

將其組合在一起：

SELECT Count(*) AS answered, 
DATE_ADD(MAKEDATE(Year(score_datetime), 1), INTERVAL Week(score_datetime) WEEK) AS week, 
     Year(score_datetime) AS year 
    FROM development.score 
    WHERE score_datetime IS NOT NULL 
    GROUP BY Week(score_datetime) 
    ORDER BY answered DESC 
    LIMIT 5;