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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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