如何为此MySql查询设置正确的索引？

Question

我有这个查询显示在MySql慢查询日志中。 （这并不慢，但它没有使用索引权）。我需要一些关于如何设置索引的帮助。

SELECT tbladded.amount*SUM(tbladdeditem.amount) 
FROM tbladded 
INNER JOIN tbladdeditem ON tbladded.addedid = tbladdeditem.addedid AND tbladdeditem.deleted='False' 
WHERE tbladded.userid=100 
AND tbladded.date='2012-01-01' 
AND tbladded.deleted='False' 
GROUP BY tbladded.addedid 


id select_type table   type possible_keys  key   key_len ref    rows Extra 
1 SIMPLE  tbladded  ref PRIMARY,userid_date userid_date 8  const,const  1  Using where 
1 SIMPLE  tbladdeditem ref addedid    addedid  5  tbladded.addedid 1  Using where 

这是表什么样子：

CREATE TABLE `tbladded` (
    `addedid` int(11) NOT NULL AUTO_INCREMENT, 
    `amount` double DEFAULT NULL, 
    `date` date DEFAULT NULL, 
    `userid` mediumint(9) DEFAULT NULL, 
    `deleted` enum('False','True') CHARACTER SET latin1 DEFAULT 'False', 
    PRIMARY KEY (`addedid`), 
    KEY `userid_date` (`userid`,`date`) USING BTREE 
) ENGINE=InnoDB DEFAULT CHARSET=utf8; 

CREATE TABLE `tbladdeditem` (
    `addeditemid` int(11) NOT NULL AUTO_INCREMENT, 
    `amount` double DEFAULT NULL, 
    `addedid` int(11) DEFAULT NULL, 
    `userid` mediumint(9) DEFAULT NULL, 
    `deleted` enum('False','True') CHARACTER SET latin1 DEFAULT 'False', 
    PRIMARY KEY (`addeditemid`), 
    KEY `addedid` (`addedid`), 
    KEY `userid` (`userid`), 
) ENGINE=InnoDB DEFAULT CHARSET=utf8; 

Answer 1

试试这个：

ALTER TABLE `tbladded` ADD INDEX 
`tbladdedIndex` (`userid`, `date`, `deleted`);