SQL USE INDEX語法錯誤

Question

我使用我的MySQL數據庫這一行：

SELECT * FROM `dump` USE INDEX `time_desc` WHERE (`nodeId`=10047 AND `time`<=1377040709 AND `valid`=1) ORDER BY `time` DESC LIMIT 1; 

我想不通爲什麼，但數據庫返回以下錯誤：

[Error: ER_PARSE_ERROR: You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near 'time_desc WHERE nodeId =10048 AND time <=1377040709 AND valid =1 ORDER BY `ti' at line 1]

任何想法，因爲我該如何解決這個問題？

Answer 1

您需要括號圍繞索引名

SELECT * 
FROM `dump` USE INDEX (`time_desc`) 
WHERE (`nodeId`=10047 AND `time`<=1377040709 AND `valid`=1) 
ORDER BY `time` DESC 
LIMIT 1; 

Answer 2

嘗試這樣的： -

SELECT * FROM `dump` USE INDEX (`time_desc`) --Use paranthesis here 
WHERE (`nodeId`=10047 AND `time`<=1377040709 AND `valid`=1) 
ORDER BY `time` DESC 
LIMIT 1; 

檢查此爲reference。