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Modify column to change its length or nullability
修改列以更改其长度或可为空特性
youdao
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The nullability characteristics of each column must be the same.
每列的为空性（nullability）特征必须相同。
youdao
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The nullability characteristics of each column must be the same.
每列的为空性（nullability）特征必须相同。
youdao