Use the srudy material provided here and try the given problem. It helps in writing complex query in efficient way.
http://nia-bi.blogspot.com/2009/11/optimizing-logic-operations.html
Saturday, December 5, 2009
Database design
Write-up at following page is useful in understanding the basic of database design.
http://office.microsoft.com/en-us/access/ha012242471033.aspx
http://office.microsoft.com/en-us/access/ha012242471033.aspx
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