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Indexes

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If you have on Index with Column A and another Index with Column A and Column B can't you just have the Index with Both Columns as long as Column A precedes column B of the composite index?With respect to Include if an Index use the same Colum(s) in the Index but you but a different combination in the Includes part do you need two indexes or will one index with the columns suffice?You knowledge would be greatly appreciated.Thanks. :-)

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