DB2列操作-添加修改删除

DB2修改长度
ALTER table T_DUALIDLE alter column FUELTYPE set data type VARCHAR(2);

DB2修改字段名称(添加后删除)
ALTER TABLE T_VEHICLE ADD COLUMN NCYLINDER DECIMAL(2);--添加列
UPDATE T_VEHICLE SET NCYLINDER=CYLINDER;
ALTER TABLE T_VEHICLE DROP COLUMN CYLINDER;--删除列
COMMENT ON T_VEHICLE ("NCYLINDER" IS '' );