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Possible Duplicate:
Should each and every table have a primary key?
If you never refer to the ID anywhere is it necessary to include one? Does a table need an ID or primary key?
No you do not need a primary key to make a table work in MySQL. That said, a primary key allows for a unique value to refer to a row in a table from another table, or in any code using the table.
You do need a primary key to make a table work well in MySQL though. Indexes (which the primary key is one of) allow MySQL to search through small, highly optimized subsets of the table to process relationships and searches. In general, any fields that you use in a
WHEREclause or use to link two tables together should be indexed.