Discussion
In entity relationship diagram the many-to-one relationships that connect a weak entity set to other entity set is represented by
Answer: D
It is drawn as a Double Diamond.
In Chen's ER notation a weak entity set is drawn as a double rectangle, and the identifying relationship that links it to its owner (strong) entity set is drawn as a double diamond. This many-to-one identifying relationship is what gives the weak entity its identity.
A plain rectangle is an ordinary entity set and a plain diamond an ordinary relationship. The double rectangle is the weak entity set itself, the usual trap, not the relationship connecting it.
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