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Answers and rating deltas for

In a database, what is the difference betwen a key and an index?

Author Votes Δ
Elie 11 +1.26
paweloque 8 +2.86
kemiller2002 4 +0.28
Walter Mitty 4 +0.57
Jonathan Beerhalter 3 +0.94
David Thornley 2 -0.47
Kirtan 2 -1.20
Rick Copeland 2 -1.80
SQLMenace 1 -1.18
Syed Tayyab Ali 1 -3.39
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