Mysql连接查询优化

Question

我在 mysql 中有两个表:

Results Table : 1046928 rows.
Nodes Table :  50 rows.

我用下面的查询连接这两个表，查询的执行速度非常非常慢。

select res.TIndex, res.PNumber, res.Sender, res.Receiver, 
sta.Nickname, rta.Nickname from ((Results res join 
Nodes sta) join Nodes rta) where ((res.sender_h=sta.name) and
(res.receiver_h=rta.name));

请帮我优化这个查询。现在，如果我只想拉出前 5 行，大约需要 5-6 分钟。谢谢。

CREATE TABLE `nodes1` (
  `NodeID` int(11) NOT NULL,
  `Name` varchar(254) NOT NULL,
  `Nickname` varchar(254) NOT NULL,
  PRIMARY KEY (`NodeID`)
) ENGINE=InnoDB DEFAULT CHARSET=latin1

CREATE TABLE `Results1` (
  `TIndex` int(11) NOT NULL,
  `PNumber` int(11) NOT NULL,
  `Sender` varchar(254) NOT NULL,
  `Receiver` varchar(254) NOT NULL,
  `PTime` datetime NOT NULL,
  PRIMARY KEY (`TIndex`,`PNumber`),
  KEY `PERIOD_TIME_IDX` (`PTime`)
) ENGINE=InnoDB DEFAULT CHARSET=latin1

Answer 1

SELECT  res.TIndex ,
        res.PNumber ,
        res.Sender ,
        res.Receiver ,
        sta.Nickname ,
        rta.Nickname
FROM    Results AS res
        INNER JOIN Nodes AS sta ON res.sender_h = sta.name
        INNER JOIN Nodes AS rta ON res.receiver_h = rta.NAME

1. 为结果创建索引(发件人_h)
2. 在结果 (receiver_h) 上创建索引
3. 创建索引在节点上(名称)