Intelligent Date Time Search in Mysql

Scenario:
We have created an audit table to records certain relevant actions taken by users of our application. The table has a primary key as well as a date/time stamp field to store when an action is taken. The interface that we use to view the audit table allows the user to select a date range.  Say All Results between March 28 - 29 , 2007.

Question:
Will Mysql search the entire table to find values with those dates or is it smart enough to look only between the dates selected? Or is there a way to make it look at the entries between the dates selected?

Can someone point me in the right direction to allow me to gain a better understanding of how Msql works in relation to a date/time search.

Thanks
winbizAsked:
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mukhtar2tCommented:
You can index the date field so it will search just the selected period
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mukhtar2tCommented:
You can check http://mysql.com for documentaion of how date indexes work if you want
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Guy Hengel [angelIII / a3]Billing EngineerCommented:
the keyword is indeed INDEXes. only with INDEXes on the relevant columns, you can improve search performance on the fields you put conditions on (WHERE, JOIN ... )
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