Normally you can't. You cannot tell if water has been frozen and then thawed.
Answer:
Originally Answered: Will there ever be a band as big as the Beatles? No, there will never be a band as popular as the Beatles. For one thing they were exceptionally good in a time of great music in general.
Explanation:
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This is about identifiers in a record referring to other records.
You can have many to one, one to one, many to many.
E.g., if you have two tables, Authors and Books, then a book record could have a reference to an author record. Since an author can write many books, this would be a many-to-one relationship.