在一個sql查詢中在不同時間段內選擇結果

Question

如何在一個查詢中選擇在5秒，5分鐘，5小時，5天，5周，5個月，5年內添加的最後記錄？

是否可以在一個查詢中選擇？

樣本記錄包括

name | added_timestamp 
v | last_five_minutes 
k | last_hour 
l | last_hour 

時間戳可以是實際時間

Answer 1

雖然你沒有說的話，我懷疑你想在不同的時間段總計：

SELECT 
    SUM(date_added > NOW() - INTERVAL 5 SECOND) as total_in_last_5_seconds, 
    SUM(date_added > NOW() - INTERVAL 5 MINUTE) as total_in_last_5_minutes, 
    SUM(date_added > NOW() - INTERVAL 5 HOUR) as total_in_last_5_hours, 
    SUM(date_added > NOW() - INTERVAL 5 DAY) as total_in_last_5_days, 
    SUM(date_added > NOW() - INTERVAL 5 WEEK) as total_in_last_5_weeks, 
    SUM(date_added > NOW() - INTERVAL 5 MONTH) as total_in_last_5_months, 
    SUM(date_added > NOW() - INTERVAL 5 YEAR) as total_in_last_5_years 
from records; 

編輯：由評論

提示如果你想實際記錄添加替代，這將它們分類：

SELECT 
    *, 
    case 
    when date_added > NOW() - INTERVAL 5 SECOND then 'last_5_seconds' 
    when date_added > NOW() - INTERVAL 5 MINUTE then 'last_5_minutes' 
    when date_added > NOW() - INTERVAL 5 HOUR then 'last_5_hours' 
    when date_added > NOW() - INTERVAL 5 DAY then 'last_5_days' 
    when date_added > NOW() - INTERVAL 5 WEEK then 'last_5_weeks' 
    when date_added > NOW() - INTERVAL 5 MONTH then 'last_5_months' 
    when date_added > NOW() - INTERVAL 5 YEAR then 'last_5_years' 
    else 'ancient' 
    end as time_category 
from records; 

Answer 2

獲得在5年內增加了最後一個記錄僞：

SELECT * FROM records WHERE date_added > NOW() - INTERVAL 5 YEAR 

然後提取5中添加記錄秒，5分鐘，5小時，5天，5周，5個月的結果。

Answer 3

SELECT 
    *, /* now just don't be lazy but specify whatever columns you want to pull */ 
    (Timestamp >= NOW() - INTERVAL 5 SECOND) AS AddedWithinSeconds, 
    (Timestamp >= NOW() - INTERVAL 5 MINUTE) AS AddedWithinMinutes, 
    (Timestamp >= NOW() - INTERVAL 5 HOUR) AS AddedWithinHours, 
    (Timestamp >= NOW() - INTERVAL 5 DAY) AS AddedWithinDays, 
    (Timestamp >= NOW() - INTERVAL 5 WEEK) AS AddedWithinWeeks, 
    (Timestamp >= NOW() - INTERVAL 5 MONTH) AS AddedWithinMonths 
FROM atable 
WHERE Timestamp >= NOW() - INTERVAL 5 YEAR 
ORDER BY 
    AddedWithinSeconds DESC, 
    AddedWithinMinutes DESC, 
    AddedWithinHours DESC, 
    AddedWithinDays DESC, 
    AddedWithinWeeks DESC, 
    AddedWithinMonths DESC