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我有两张桌子：

playerstatstable，入口表（见下文）

playerstatstable 有 100,000 行，entrytable 有 1 百万行

我想要做的是更新 playerstatstable 如下

UPDATE playerstatstable set totalScore = totalScore+1000 where PlayerID = (Select PlayerID from entrytable where score = 1 and entryState = 5 and playerstatstable.PlayerID = entrytable.PlayerID);

大约 1/10 的条目将处于状态 5，其中大约 1/5 的分数 = 1；

所以我有大约 20,000 个条目与需要更新的 20,000 个 playerstatstable 行相关联。

1）有更好的更新声明吗？
2）是否有任何索引/键安排可以改善这一点？

CREATE TABLE `playerstatstable` (   
  `PlayerID` int(11) NOT NULL,  
  `totalScore` int(11) DEFAULT '0', 
  PRIMARY KEY (`PlayerID`), 
  UNIQUE KEY `PlayerID_UNIQUE` (`PlayerID`),    
  KEY `idx_m` (`monthTime`),    
  KEY `idx_w` (`weekTime`), 
  KEY `idx_d` (`dayTime`)   
) ENGINE=InnoDB DEFAULT CHARSET=utf8;   


CREATE TABLE `entrytable` (
  `EntryID` int(10) unsigned NOT NULL AUTO_INCREMENT,
  `PlayerID` int(10) unsigned DEFAULT '0',
  `entryType` bit(1) DEFAULT b'0',
  `entryState` int(11) DEFAULT '1',
  `score` int(11) DEFAULT '0',
  `rank` int(11) DEFAULT '0',
  PRIMARY KEY (`EntryID`),
  UNIQUE KEY `EntryID_UNIQUE` (`EntryID`)
) ENGINE=InnoDB
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1 回答 1

1

请试试这个。 

UPDATE t1 set t1.totalScore = t1.totalScore+1000 
from playerstatstable t1  inner join entrytable t2
on t.PlayerID = t2.PlayerID 
and t2.score = 1 and t2.entryState = 5

对于 MYSQL

UPDATE
playerstatstable t1, entrytable t2
set t1.totalScore = t1.totalScore+1000 
where t.PlayerID = t2.PlayerID 
and t2.score = 1 and t2.entryState = 5
于 2013-06-06T13:49:46.647 回答