Poor summary about column considerations in an index. For the complete picture, I suggest http://sqlinthewild.co.za/index.php/2009/01/19/index-columns-selectivity-and-equality-predicates/">
http://sqlinthewild.co.za/index.php/2009/01/19/index-columns-selectivity-and-equality-predicates/
Wilfred
The best things in life are the simple things