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update CHELIANG_MINGDAN set clmd_yunxuzaizhong = cast(clmd_yunxuzaizhong/1000 as decimal(14,4)) where clmd_yunxuzaizhong is not null
update CHELIANG_MINGDAN set clmd_carweight = cast(clmd_carweight/1000 as decimal(14,4)) where clmd_carweight is not null ......

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