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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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