檢索目標c中最後10條記錄的最大值

Question

我想檢索sqlite數據庫中最後10條記錄的maximum value，我使用下面的查詢但它檢索所有column的maximum value不只是最後10個我能解決這個問題嗎？

select ifnull(Max(Systolic),0) from PressureAndHR order by ID desc limit 10; 

謝謝U，

Answer 1

嘗試修改從

select ifnull(Max(Systolic),0) from PressureAndHR order by ID desc limit 10; 

到

SELECT ifnull(Max(Systolic),0) FROM (SELECT * PressureAndHR ORDER by ID DESC limit 10);