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Editorial Team
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Asked: 2026-05-18T05:03:37+00:00

Looking at a mysqldump -d and see a key that is KEY, not PRIMARY

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Looking at a “mysqldump -d” and see a key that is KEY, not “PRIMARY KEY” or “FOREIGN KEY”

What is KEY?

Example:

CREATE TABLE IF NOT EXISTS `TABLE_001` (
  `COL_001` int(256) NOT NULL,
  `COL_002` int(256) NOT NULL,
  `COL_003` int(256) NOT NULL,
  `COL_004` int(256) NOT NULL,
  `COL_005` int(256) NOT NULL,
  `COL_006` int(256) NOT NULL,
  `COL_007` int(256) NOT NULL,
  `COL_008` int(256) NOT NULL,
  `COL_009` int(256) NOT NULL,
  `COL_010` int(256) NOT NULL,
  `COL_011` int(256) NOT NULL,
  `COL_012` int(256) NOT NULL,
  PRIMARY KEY  (`COL_001`),
  KEY `COL_002` (`COL_002`,`COL_003`),
  KEY `COL_012` (`COL_012`),
) ENGINE=MyISAM DEFAULT CHARSET=utf8;

Also, when I’m create a new version of this table, will changing MyISAM to InnoDB require any additional changes besides “ENGINE=MyISAM” to “ENGINE=InnoDB”?

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1 Answer

  1. Editorial Team

    KEY is alternative syntax for index declaration. The CREATE TABLE statement includes creating two indexes, on COL_002 and COL_012 separately.

    …when I’m create a new version of this table, will changing MyISAM to InnoDB require any additional changes besides “ENGINE=MyISAM” to “ENGINE=InnoDB”?

    No, that should be fine but be aware that you can’t use MySQL’s native Full Text Search (FTS) on tables using the Innodb engine — they have to be MyISAM before you can full text index columns in them.

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