SQL USE INDEX语法错误

Question

我在MySQL数据库中使用这一行：

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

我无法弄清楚原因，但数据库返回以下错误：

  

[错误：ER_PARSE_ERROR：您的SQL语法中有错误;校验   与您的MySQL服务器版本对应的手册   在'time_desc WHERE nodeId = 10048 AND附近使用的语法   time＆lt; = 1377040709 AND valid = 1在第1行的'ti'订购]

有关我如何解决这个问题的想法吗？

Answer 1

您需要围绕索引名称

的括号

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

Answer 2

试试这样： -

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;

选中reference。