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我用 MySQL 创建了一个联合表，我发现生成的本地表只包含远程表数据的子集。

这是联邦：

CREATE TABLE `Activities` (
  `idActivity` int(10) unsigned NOT NULL AUTO_INCREMENT,
  `Periods_idPeriod` int(10) unsigned NOT NULL DEFAULT 1,
  `applicationActivityId` varchar(255) DEFAULT NULL,
  `previousApplicationActivityId` varchar(255) DEFAULT NULL,
  `title` text,
  `ActivityTypes_idActivityType` int(10) unsigned DEFAULT 4,
  `comment1` text,
  `comment2` text,
  `comment3` text,
  `Areas_idArea` int(10) unsigned DEFAULT NULL,
  `sentReports` int(11) DEFAULT '1',
  PRIMARY KEY (`idActivity`)
) ENGINE=FEDERATED DEFAULT CHARSET=latin1 CONNECTION='mysql://admin:*******@*******:3306/sup_supperdb/Activities';

这是远程（原始）之一：

CREATE TABLE `Activities` (
  `idActivity` int(10) unsigned NOT NULL auto_increment,
  `Periods_idPeriod` int(10) unsigned NOT NULL default '0',
  `applicationActivityId` varchar(255) default NULL,
  `previousApplicationActivityId` varchar(255) default NULL,
  `title` text,
  `ActivityTypes_idActivityType` int(10) unsigned default NULL,
  `comment1` text,
  `comment2` text,
  `comment3` text,
  `Areas_idArea` int(10) unsigned default NULL,
  `sentReports` int(11) default '1',
  PRIMARY KEY  (`idActivity`),
  KEY `Activities_FKIndex1` (`Periods_idPeriod`),
  KEY `Areas_idArea` (`Areas_idArea`),
  KEY `ActivityTypes_idActivityType` (`ActivityTypes_idActivityType`),
  CONSTRAINT `Activities_ibfk_1` FOREIGN KEY (`Areas_idArea`) REFERENCES `Areas` (`idArea`) ON DELETE SET NULL,
  CONSTRAINT `Activities_ibfk_2` FOREIGN KEY (`ActivityTypes_idActivityType`) REFERENCES `ActivityTypes` (`idActivityType`) ON DELETE SET NULL,
  CONSTRAINT `Activities_ibfk_3` FOREIGN KEY (`Periods_idPeriod`) REFERENCES `Periods` (`idPeriod`)
) ENGINE=InnoDB DEFAULT CHARSET=latin1

在原始行中，我得到 3045 行，但在联邦中只有 2946 行。

如果有人对可能发生的事情有提示，或者是否存在某种联合表限制，他的评论将不胜感激。

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