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Define weak and strong entity sets?
Weak entity set: entity set that do not have key attribute of their own are known as weak entity sets.
Strong entity set: Entity set that has a primary key is term a strong entity set.
Dirty Reads: T10 reads a value which is updated by T9. This update has not been committed and T9 aborts. T9 T10 Value of x old value = 200
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