Regarding the schema below, why is the link NOT optimized?

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answerhappygod
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Regarding the schema below, why is the link NOT optimized?

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Regarding the schema below, why is the link NOT optimized?
Regarding The S 1
Regarding The S 1 (88.71 KiB) Viewed 44 times
A. Integrity rules are not defined
B. The sequence for filling primary key values is not defined
C. The automatic primary key is not used
D. There is no unique index on the idPurchase attribute
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