MySQL的刪除最早的記錄表中​​的

Question

大家好我想拿出一個sql將刪除數據庫中的一個最古老的行，目前我有這樣的：

DELETE FROM `videos` WHERE date_added IS NOT NULL LIMIT 1 

意志，只有不斷從刪除我的數據庫的頂部或將隨機選擇？

Answer 1

您可以使用order by和嘗試像這個 -

DELETE FROM `videos` WHERE date_added IS NOT NULL order by date_added desc LIMIT 1 

欲瞭解更多信息：http://dev.mysql.com/doc/refman/5.0/en/order-by-optimization.html

Answer 2

DELETE FROM `videos` order by date_added desc LIMIT 1 

如果你只需要刪除上面的查詢最早的記錄使用，否則需要檢查一些條件使用這一個

DELETE FROM `videos` WHERE date_added IS NOT NULL order by date_added desc LIMIT 1 

Answer 3

單程，你可以米atch以最小日期值，然後可以刪除記錄。

DELETE FROM `videos` WHERE date_added = (SELECT min(date_added) from videos) AND date_added IS NOT NULL LIMIT 1 

而在第二種方式中，您可以使用order by子句進行刪除。

DELETE FROM `videos` WHERE date_added IS NOT NULL ORDER BY date_added ASC LIMIT 1 

Answer 4

試試這個

DELETE FROM `videos` order by date_added DESC LIMIT 1 

Answer 5

你需要按日期來訂購吧，降，所以第一個結果是最古老的一個，然後刪除第一個結果。

DELETE FROM `videos` 
WHERE data_added IS NOT NULL 
ORDER BY date_added DESC 
LIMIT 1; 

該解決方案，只要您date_added列是MySQL的日期型或數字型（如Unix時間戳）工作。如果沒有，你應該投入數據或修改你的數據庫的結構（我推薦以後）。

爲了投中的數據，你可以這樣做：

DELETE FROM `videos` 
WHERE data_added IS NOT NULL 
ORDER BY Cast(date_added as date) DESC 
LIMIT 1; 

Answer 6

您還可以通過ID刪除記錄（如果是自動遞增）

DELETE FROM `videos` order by id DESC LIMIT 1 

這將刪除最後一個記錄