Question

我有一个带有timestamp列的表我希望得到特定月份中的时间戳（例如，9月1日到30 septemper之间的timpestamp）的值，如果月份是31天则考虑到这一点。我使用这个查询：

SELECT users.username, users.id, count(tahminler.tahmin)as tahmins_no FROM users LEFT JOIN tahminler ON users.id = tahminler.user_id  GROUP BY users.id having count(tahminler.tahmin) > 0

我可以添加where timestamp IN(dates_array) ??

date_array将是整个月的日期？

Answer 1

SELECT users.username, users.id, count(tahminler.tahmin)as tahmins_no 
FROM users 
LEFT JOIN tahminler ON users.id = tahminler.user_id  
where year(timestamp) = 2013 and month(timestamp) = 9
GROUP BY users.id 
having count(tahminler.tahmin) > 0

使其可以使用您可以执行的索引

SELECT users.username, users.id, count(tahminler.tahmin)as tahmins_no 
FROM users 
LEFT JOIN tahminler ON users.id = tahminler.user_id  
where timestamp >= '2013-09-01' and timestamp < '2013-10-01'
GROUP BY users.id 
having count(tahminler.tahmin) > 0

Answer 2

如果是TIMESTAMP

YEAR (TIMESTAMP) = 2013 AND MONTH (TIMESTAMP) = 9

包含在同一条款中

DATE_FORMAT(TIMESTAMP,'%Y-%m')='2013-09'

用于unix时间戳

YEAR (FROM_UNIXTIME(TIMESTAMP)) = 2013 AND MONTH(FROM_UNIXTIME(TIMESTAMP))=9

包含在同一条款中

DATE_FORMAT(FROM_UNIXTIME(TIMESTAMP),'%Y-%m')='2013-09'

Answer 3

如果我理解你的问题你可以添加：

WHERE MONTH(timestamp)=9

如何在where子句中比较Timestamp

3 个答案: