what index is faster to scan

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Subject: what index is faster to scan
From: Adam Radłowski <adamr@xxxxxxxxxxxxxxxxxxxxx>
Date: Mon, 16 Apr 2007 21:50:08 +0200
User-agent: Thunderbird 1.5.0.7 (X11/20060909)

Hello!
I'm thinking about two things:

1. what index is faster to scan (for select ... where statements) uniqueor not unique ?2. can the unique index to slow inserts commands (in comparison with notunique index) ?

Best regards
Adam

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