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primary key vs unique index

max_dub asked
Last Modified: 2008-01-09
I have 2 tables and i want to retrieve data from them and combine data to do some processing
I haven't made any column as PRIMARY yet ..

what is better to way do, shud i make col. as PRIMARY KEY in the tables separately or can i also make UNIQUE INDEX .. is unique index similar to making primary key ..

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if i am not clear on question, please let me knw.. i am just getting to knw db's
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PS. There is no additional overhead for the PK, just benefit.  



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