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فرمت فایل:  ورد ( قابلیت ویرایش )  قسمتی از محتوی متن ...   تعداد صفحات : 32 صفحه موضوع تحقیق : View . فهرست . مقدمه . جداول مبنا و دیدگاه . معماری سه سطحی. دید ادراکی. دید خارجی. دید داخلی. زبان میزبان. زبان داده ای فرعی. جداول اولیه و ارائه شده ، جداول مبنا (base table) نامیده می شوند .جدولی که توسط بعضی از عبارات رابطه ای از این جداول مبنا بدست می آید ، جدول مشتق شده (driven) نامیده می شود .بنابراین طبق تعریف ، جداول مبنا دارای وجود و موجودیت مستقل بوده (independent existence) درحالی که جداول مشتق دارای این تعریف نیستند ( جداول مشتق متکی به جداول مبنا هستند ) . بنابراین مشاهده می شود که یک جدول مشتق دقیقا جدولی است که برحسب جداول دیگری تعریف می شود و واضح است که یک جدول مبنا دقیقا یک جدول مشتق نمی باشد . اکنون ، سیستم های رابطه ای به طور مشخص باید درمرحله اول امکانی را برای ایجاد جداول مبنا فراهم سازند، برای مثال در SQL این مورد توسط عبارت CREATE TABLE انجام می شود ( توجه کنید دراینجا منظور از TABLE دقیقا جدول مبنا می باشد ) و به طور مشخص جداول مبنا ب ...

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