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NOTNULL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。
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NOTNULL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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