DROP DATABASE IF EXISTS test;
CREATE DATABASE test;
USE test;

CREATE TABLE `t1` (
  `id` int(10) unsigned NOT NULL AUTO_INCREMENT,
  `c` varchar(26) NOT NULL,
  PRIMARY KEY (`id`)
) ENGINE=MyISAM;

INSERT INTO `t1` VALUES (1,'a'),(2,'b'),(3,'c'),(4,'d'),(5,'e'),(6,'f'),(7,'g'),(8,'h'),(9,'i'),(10,'j'),(11,'k'),(12,'l'),(13,'m'),(14,'n'),(15,'o'),(16,'p'),(17,'q'),(18,'r'),(19,'s'),(20,'t'),(21,'u'),(22,'v'),(23,'w'),(24,'x'),(25,'y'),(26,'z');

CREATE TABLE `t2` (
  `id` int(10) unsigned NOT NULL AUTO_INCREMENT,
  `c` varchar(26) NOT NULL,
  PRIMARY KEY (`id`)
) ENGINE=MyISAM;

INSERT INTO `t2` VALUES (1,'a'),(2,'b'),(3,'c'),(4,'d'),(5,'e'),(6,'f'),(7,'g'),(8,'h'),(9,'i'),(10,'j'),(11,'k'),(12,'l'),(13,'m'),(14,'n'),(15,'o'),(16,'p'),(17,'q'),(18,'r'),(19,'s'),(20,'t'),(21,'u'),(22,'v'),(23,'w'),(24,'x'),(25,'y'),(26,'z');

CREATE TABLE `t3` (
  `id` int(10) unsigned NOT NULL AUTO_INCREMENT,
  `c` varchar(26) NOT NULL,
  PRIMARY KEY (`id`)
) ENGINE=MyISAM;

INSERT INTO `t3` VALUES (1,'a'),(2,'b'),(3,'c'),(4,'d'),(5,'e'),(6,'f'),(7,'g'),(8,'h'),(9,'i'),(10,'j'),(11,'k'),(12,'l'),(13,'m'),(14,'n'),(15,'o'),(16,'p'),(17,'q'),(18,'r'),(19,'s'),(20,'t'),(21,'u'),(22,'v'),(23,'w'),(24,'x'),(25,'y'),(26,'z');