Unterschiede

Hier werden die Unterschiede zwischen zwei Versionen angezeigt.

--- modul:m290:learningunits:lu03:loesungen:l06 [2024/09/09 13:54] – vdemir
+++ modul:m290:learningunits:lu03:loesungen:l06 [2024/10/02 15:12] (aktuell) – vdemir
@@ Zeile 1: / Zeile 1: @@
-====== LU03.A06 - ERM vs. ERD ======
+====== LU04.S06 - ERM vs. ERD ======
-**ERM**
-  * Description: First step to find the entities and the correlations between them.
-  * Purpose: Blueprint
-  * Similiarties
-    - sdfasdf
-    - sdfasdf
-**ERD**
-  * Definition:Identification of details, such as data-types, relation-table and the cardinality
-  * Purpose: technical plan, ready to construct the data base
-| Purpose |  |  |
-| Similaritiy | Notation method for data-base strucure in order to descripe business cases| |
-| Differences |
 ===== Prerequisites  =====
@@ Zeile 25: / Zeile 8: @@
 ===== Task  =====
-Compare both terms, ERM and ERD,  and describe the purpose of each, and find at least 3 similarities and 3 differences.
+Compare both terms, ERM and ERD,  and describe the purpose of each, and find at least 2 similarities and 2 differences.
+**ERM**
+  * Description: First step to find the entities and the correlations between them.
+  * Purpose: Blueprint of the business cases
+**ERD**
+  * Description:Identification of details, such as data-types, relation-table and the cardinality
+  * Purpose: construction plan, ready to build up the data-base physically
+**Similarties**
+  * Both notation methods are used to describe the data-base structure of the business cases
+  * Entity = rectangle
+  * Cardinalities: 1:1, 1:n, n:m
+  * Entities have attributes
-===== Solution =====
+ **Differences:**
-[[modul:m290:learningunits:lu03:loesungen:l06|Lösung]]
+  * Relations:
+    * ERM: rhomb
+    * ERD: relalation-table
+    * ERD: Described in the Crow's foot notation
+  * Attributes:
+    * ERM: bubbles above, which are connected with the entity
+    * ERD: As details in the Entity, including data-type
+    * ERD: Memory amount is describes within the data-type defintion
 ===== Vocabulary =====