a foreign key is a secondary key
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The law of reflection states that the angle of reflection equals the angle of incidence—θr = θi. The angles are measured relative to the perpendicular to the surface at the point where the ray strikes the surface.
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A foreign key is a key that references an index on some other table. ... That country column in the customer table would be a foreign key. A secondary key on the other hand is just a different column in the table that you have used to create an index (which is used to speed up queries).
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