数据存储在表(table)中。例如,学生注册系统包含STUDENT表。表拥有一组行(row)。每行包含一名学生的信息。表的每个列(column)只描述学生的某一方面的信息。在例子中,列为ld、Name、Address和Status。每列有一个关联类型,称为该列的域(domain),每行在该列的值都来自这个域。例如,Id的域是整型,而Name的域是字符串型。-------------------------------行是一个xx的多个列信息,列是某方面信息。。。。
每天都在舔鞋底
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RE: 每天都在舔鞋底 - by JJJ大大 - 01-28-2023, 04:56 PM
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