如何在where子句中比较时间戳 [英] How to compare Timestamp in where clause

问题描述

我有一个带有timestamp列的表，我想获取特定月份(例如9月1日至9月30日之间的timpestamp)在考虑月份(如果该月份为31天)时需要考虑的值. 我使用以下查询:

I have a table with timestamp column i want to get the values where the timestamp in specific month (for example where the timpestamp between 1 september and 30 septemper) taking in considration if the month is 31 day. I use this query:

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?

date_array will be the dates of the whole month??

推荐答案

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

要使其与索引一起使用，您可以做

To make it work with indexes you can do

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

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