Primary vs Unique Index

From: Gonzo Rock <GonzoRock(at)Excite(dot)com>
To: pgsql-sql(at)postgresql(dot)org
Subject: Primary vs Unique Index
Date: 2001-08-21 06:45:10
Message-ID: 3.0.5.32.20010820234510.009c5530@postoffice.pacbell.net
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Why would one need a Primary Key... which can only be declared at table creation if one can create a Unique Index post table creation?

ie: I deleted my primary key... is that a big deal? What's the purpose of the Primary Key if it's function can be duplicated with another Unique Index?

thanks,

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