... nul 空 null attribute 空属性 null character string 空字符串 ...
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The NOT NULL attribute of column Credit_Line in table ACCOUNT has to be dropped because some other account types have been added that do not have a credit line.
ACCOUNT 表中的 Credit_Line 列的 NOT NULL 属性必须删除,这是因为添加了没有信用行的其他账号类型。
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