Could someone give me an example of a strong and weak entity. The definition of weak entity is: 39 a dashed line means that the relationship is strong, whereas a solid line means that the relationship is weak.
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The condition minimum cardinality of 1 does not imply/necessitate that a relationship involves strong & weak entities.
That's why you can't have many strong entities mapping to the weak entity.
I've tried to look on google about a decent explanation of weak and strong entity type, but i haven't fully understood them. A weak entity is an entity that cannot be uniquely identified by its attributes alone; As you've probably realised, in practice there is little or no difference in sql implementations between a table representing a strong entity and one representing a weak entity. On the following diagram how do we decide that the relationship between.
Therefore, it must use a foreign key in conjunction with its attributes to create a. In general, if a strong entity has a multivalued attributes, a new table is created which contains the key of the strong entity and the multivalued attribute (they're defined as the primary key. In order to do so, the strong entity. There may exist a situation where a child itself has a primary key but existence of.
