Tuto vidéo : Modèle Conceptuel des Données - Entité - Association

Blog T.I.M. : blogtim.fr
Points à retenir :
MCD Modèle ENTITÉ - ASSOCIATION
ENTITÉ = rectangle - ASSOCIATION = ellipse
ATTRIBUTS : caractéristiques
CARDINALITÉ : minimum et maximum de fois qu'une occurrence de E apparaît dans A

[@romainmartin7023]

Très bonne vidéo. Je pense que les professeurs qui s'investissent comme cela autant que vous devrait être plus récompensé.

[@Sirjio]

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.

[@anonymousbelgique7331]

C'est tres bien expliqué , merci !

[@zoulou1119]

Simple et efficace merci

[@arameleye2498]

❤❤❤❤

[@blaisenzeobame2392]

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?

[@EvodieKatesha]

Ici chez vous on enregistre pas le tuto