text: INSERT INTO `items`
  SELECT * FROM `items_1`
  UNION SELECT * FROM `items_2`;
  
  ALTER TABLE `reviews_` DROP `id`;
  ALTER TABLE `reviews_` ADD `id` BIGINT(20) NOT NULL AUTO_INCREMENT PRIMARY KEY FIRST;
  
  
  SELECT * FROM `reviews_01`
  WHERE `user_name` IN (
    SELECT `user_name`
  	FROM `reviews_01`
  	WHERE `item_id`='penroom:sheaffer_s002' OR `item_id`='2-itamae:sandannp'
  	GROUP BY `user_name`
  	HAVING COUNT(*) = 2
  )
  AND (`item_id`='penroom:sheaffer_s002' OR `item_id`='2-itamae:sandannp');
  
  ALTER TABLE `reviews_` DROP `id`;
  ALTER TABLE `reviews_` ADD `id` BIGINT(20) NOT NULL AUTO_INCREMENT PRIMARY KEY FIRST;
  UPDATE `reviews_` SET `id`=`id`+;
  RENAME TABLE `vrshopping03`.`reviews_` TO `vrshopping03`.`reviews_0`;
  
  SELECT *
  FROM
  `reviews_01`R1,
  `reviews_02`R2,
  `reviews_03`R3,
  `reviews_04`R4,
  `reviews_05`R5,
  `reviews_06`R6,
  `reviews_07`R7,
  `reviews_08`R8,
  `reviews_09`R9,
  `reviews_10`R10,
  `reviews_11`R11,
  `reviews_12`R12,
  `reviews_13`R13,
  `reviews_14`R14,
  `reviews_15`R15,
  `reviews_16`R16,
  `reviews_17`R17,
  `reviews_18`R18,
  `reviews_19`R19,
  `reviews_20`R20,
  `reviews_21`R21,
  `reviews_22`R22,
  `reviews_23`R23,
  `reviews_24`R24,
  `reviews_25`R25,
  `reviews_26`R26,
  `reviews_27`R27,
  `reviews_28`R28,
  `reviews_29`R29,
  `reviews_30`R30,
  `reviews_31`R31,
  `reviews_32`R32,
  `reviews_33`R33,
  `reviews_34`R34,
  `reviews_35`R35,
  `reviews_36`R36
  WHERE
  R1.`user_name`
  
  
  SELECT *
  FROM
  `reviews_01`R1,
  `reviews_02`R2
  WHERE
  R1.`user_name`=R2.`user_name`
  AND R1.`item_id`=R2.`item_id`;
  