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CREATE TABLE `XYZ` ( `CODE` CHAR(34) ); INSERT INTO `XYZ` VALUES ('CODE'); INSERT INTO `XYZ` VALUES ('CODE1'); INSERT INTO `XYZ` VALUES ('COD'); INSERT INTO `XYZ` VALUES (''); SELECT * FROM `XYZ`; ALTER TABLE `XYZ` CHANGE `CODE` `CODE2` CHAR(34); SELECT * FROM `XYZ`; ALTER TABLE `XYZ` ADD `CODE` CHAR(4); UPDATE `XYZ` SET `CODE` = SUBSTR(`CODE2`, 1, 4); ALTER TABLE `XYZ` DROP COLUMN `CODE2`; SELECT * FROM `XYZ`;
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