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  • mysql merge table

    SELECT COUNT(*) FROM `comment` 
    
    SHOW CREATE TABLE `comment`
    
    CREATE TABLE `comment1` (
      `id` INT(8) NOT NULL AUTO_INCREMENT,
      `blogUser` VARCHAR(20) NOT NULL,
      `replayUser` VARCHAR(20) NOT NULL,
      `articleId` INT(8) NOT NULL DEFAULT '0',
      `content` TEXT,
      `addTime` DATETIME NOT NULL,
      PRIMARY KEY (`id`),
      KEY `addTime` (`addTime`),
      KEY `replayUser` (`replayUser`)
    ) ENGINE=MYISAM AUTO_INCREMENT=1000004 DEFAULT CHARSET=utf8
    INSERT INTO comment1 SELECT  `id` ,
      `blogUser`,
      `replayUser`,
      `articleId` ,
      `content` ,
      `addTime`
    FROM `comment` LIMIT 0,500003
    
    CREATE TABLE `comment2` (
      `id` INT(8) NOT NULL AUTO_INCREMENT,
      `blogUser` VARCHAR(20) NOT NULL,
      `replayUser` VARCHAR(20) NOT NULL,
      `articleId` INT(8) NOT NULL DEFAULT '0',
      `content` TEXT,
      `addTime` DATETIME NOT NULL,
      PRIMARY KEY (`id`),
      KEY `addTime` (`addTime`),
      KEY `replayUser` (`replayUser`)
    ) ENGINE=MYISAM AUTO_INCREMENT=1 DEFAULT CHARSET=utf8
    
    INSERT INTO comment1 SELECT  `id` ,
      `blogUser`,
      `replayUser`,
      `articleId` ,
      `content` ,
      `addTime`
    FROM `comment` LIMIT 500003,60000000
    
    CREATE TABLE `allcomment` (
      `id` INT(8) NOT NULL AUTO_INCREMENT,
      `blogUser` VARCHAR(20) NOT NULL,
      `replayUser` VARCHAR(20) NOT NULL,
      `articleId` INT(8) NOT NULL DEFAULT '0',
      `content` TEXT,
      `addTime` DATETIME NOT NULL,
      PRIMARY KEY (`id`),
      KEY `addTime` (`addTime`),
      KEY `replayUser` (`replayUser`)
    ) ENGINE=MERGE UNION (comment1, comment2) INSERT_METHOD=LAST AUTO_INCREMENT=1 ; 
    
    SELECT COUNT(*) FROM `allcomment`

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  • 原文地址:https://www.cnblogs.com/duyinqiang/p/5696373.html
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