00:04 📊 The goal is to understand how to create a conceptual data model from a data dictionary for a database. 00:32 📝 Entities represent groups of similar objects, each instance having distinct properties or attributes (e.g., customer entity with attributes like name, address). 01:12 🔄 Associations, depicted as ellipses, link entities; entities (rectangles) have names and attributes (e.g., a "Invoice" entity with attributes like invoice number and date). 02:21 🧩 Associations can have attributes (e.g., quantity), and cardinality defines the minimum and maximum number of instances related on each side (e.g., 1:N relationship). 03:33 🧾 Entities, occurrences, and attributes are fundamental components; entities are sets of similar objects, occurrences are individual objects, and attributes define characteristics with specific value domains. 04:40 🤝 Associations can link multiple entities, and cardinality (e.g., 0..1, 0..N, 1..1, 1..N) specifies the minimum and maximum participation of entities in an association. 05:38 📉 Systematic approach to determining minimum and maximum cardinalities: identify entities that must participate, ensuring each entity appears at least once (0..1), and determining the maximum occurrences (0..N, 1..N). 06:21 🔜 The next video will cover transitioning from the conceptual data model to the logical model.
Très bonne vidéo. Je pense que les professeurs qui s'investissent comme cela autant que vous devrait être plus récompensé.
Simple et efficace merci
C'est tres bien expliqué , merci !
00:04 📊 The goal is to understand how to create a conceptual data model from a data dictionary for a database.
00:32 📝 Entities represent groups of similar objects, each instance having distinct properties or attributes (e.g., customer entity with attributes like name, address).
01:12 🔄 Associations, depicted as ellipses, link entities; entities (rectangles) have names and attributes (e.g., a "Invoice" entity with attributes like invoice number and date).
02:21 🧩 Associations can have attributes (e.g., quantity), and cardinality defines the minimum and maximum number of instances related on each side (e.g., 1:N relationship).
03:33 🧾 Entities, occurrences, and attributes are fundamental components; entities are sets of similar objects, occurrences are individual objects, and attributes define characteristics with specific value domains.
04:40 🤝 Associations can link multiple entities, and cardinality (e.g., 0..1, 0..N, 1..1, 1..N) specifies the minimum and maximum participation of entities in an association.
05:38 📉 Systematic approach to determining minimum and maximum cardinalities: identify entities that must participate, ensuring each entity appears at least once (0..1), and determining the maximum occurrences (0..N, 1..N).
06:21 🔜 The next video will cover transitioning from the conceptual data model to the logical model.
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J’ai pas très bien compris!
On est considéré comment client que si on achète un article!
Alors comment un un client peut avoir 0 facture?
Ici chez vous on enregistre pas le tuto