DataBase قواعد بيانات
السلام عليكم ورحمة الله وبركاته تكليف المحاضرة القادمة بحسب المخطط التالي
اغلب الاسئلة نفس افكار اسئلة هذا التكليف
https://www.lucidchart.com/pages/er-diagrams
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Lucidchart
What is an Entity Relationship Diagram (ERD)?
What is an Entity Relationship Diagram (ERD)? See ultimate guide to ER diagrams including a video overview, origins, uses, examples, components, limitations, and guidelines on how to draw them for free in Lucidchart.
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https://www.guru99.com/er-diagram-tutorial-dbms.html
من افضل المواقع عالمياً لتعلم قواعد البيانات بشكل احترافياً
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Guru99
Entity Relationship (ER) Diagram Model with DBMS Example
What is the ER Model? The ER or (Entity Relational Model) is a high-level conceptual data model diagram. Entity-Relation model is based on the notion of real-world entities and the relationship betwee
انواع المفاتيح : ( سيتم انزال الترجمة عند التفرغ لذلك )
Entity keys: Refers to an attribute that uniquely defines an entity in an entity set. Entity keys can be super, candidate or primary.
Super key: A set of attributes (one or more) that together define an entity in an entity set.
Candidate key: A minimal super key, meaning it has the least possible number of attributes to still be a super key.
An entity set may have more than one candidate key.
Primary key: A candidate key chosen by the database designer to uniquely identify the entity set.
Foreign key: Identifies the relationship between entities
Entity keys: Refers to an attribute that uniquely defines an entity in an entity set. Entity keys can be super, candidate or primary.
Super key: A set of attributes (one or more) that together define an entity in an entity set.
Candidate key: A minimal super key, meaning it has the least possible number of attributes to still be a super key.
An entity set may have more than one candidate key.
Primary key: A candidate key chosen by the database designer to uniquely identify the entity set.
Foreign key: Identifies the relationship between entities
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