A strong entity is an entity that can exist independently without needing any other entities. It has a primary key which uniquely identifies each instance of the entity. For example, in a school database, the 'Student' entity would be a strong entity as it can exist without needing to be associated with any other entities, and each student can be uniquely identified by a 'StudentID'.

On the other hand, a weak entity is an entity that cannot exist without being associated with another entity, which is known as its owner entity. A weak entity does not have a primary key of its own, but instead uses a foreign key combined with some of its attributes to uniquely identify its instances. For example, in the same school database, the 'Classroom' entity could be a weak entity if each classroom is uniquely identified not just by a 'ClassroomNumber', but by a combination of 'ClassroomNumber' and the 'Building' entity that it is associated with. In this case, the 'Classroom' entity cannot exist without being associated with a 'Building' entity.

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A strong entity is an entity that can exist independently without needing any other entities. It has a primary key which uniquely identifies each instance of the entity. For example, in a school database, the 'Student' entity would be a strong entity as it can exist without needing to be associated with any other entities, and each student can be uniquely identified by a 'StudentID'.

On the other hand, a weak entity is an entity that cannot exist without being associated with another entity, which is known as its owner entity. A weak entity does not have a primary key of its own, but instead uses a foreign key combined with some of its attributes to uniquely identify its instances. For example, in the same school database, the 'Classroom' entity could be a weak entity if each classroom is uniquely identified not just by a 'ClassroomNumber', but by a combination of 'ClassroomNumber' and the 'Building' entity that it is associated with. In this case, the 'Classroom' entity cannot exist without being associated with a 'Building' entity.

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A strong entity is an entity that can exist independently without needing any other entities. It has a primary key which uniquely identifies each instance of the entity. For example, in a school database, the 'Student' entity would be a strong entity as it can exist without needing to be associated with any other entities, and each student can be uniquely identified by a 'StudentID'.

On the other hand, a weak entity is an entity that cannot exist without being associated with another entity, which is known as its owner entity. A weak entity does not have a primary key of its own, but instead uses a foreign key combined with some of its attributes to uniquely identify its instances. For example, in the same school database, the 'Classroom' entity could be a weak entity if each classroom is uniquely identified not just by a 'ClassroomNumber', but by a combination of 'ClassroomNumber' and the 'Building' entity that it is associated with. In this case, the 'Classroom' entity cannot exist without being associated with a 'Building' entity.

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