A is an entity It has an attribute, a id as its identifier B is a weak entity that depends on A It has b id as its discriminator Many instances ofB may belong to the same instance of A

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A is an entity. It has an attribute, a _ id as its identifier. B is a weak entity that depends on A . It

A is an entity. It has an attribute,

_

as its identifier. B is a weak entity that depends on A

.

It has

_

as its discriminator. Many instances ofB may belong to the same instance of A

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