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تعريف قواعد البيانات

عبارة عن مجموعة من الجداول المترابطة فيما بينها

قواعد البيانات مجموعة من الجداول المترابطة فيما بينها بعلاقة
أنواع المفاتيح المفتاح الأساسي - المفتاح الأجنبي
المفتاح الأساسي حقل فريد ولا تتكرر قيمه
المفتاح المركب مجموعة حقول لا تتكرر قيمها معا وتشكل مفتاحا اساسيا
المفتاح الأجنبي هو حقل أساسي في جدول تم اضافته الى جدول اخر
علاقة one to one تعني أن كل سجل من الجدول الأول يرتبط مع سجل واحد فقط من الجدول الثاني والعكس
علاقة one to many ارتباط كل سجل من الجدول الأول بمجموعة سجلات من الجدول الثاني
علاقة many to many ارتباط كل سجل من الجدول الأول مع مجموعة سجلات من الجدول الثاني وبالعكس أيضا
Created by: suhila


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