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how to reduce query time for un indexed table

NiceMan331 asked
Last Modified: 2015-01-05
we purchased POS , where they provided a solution that daily basis every point of sales will send its data as text file
then to append it all into one table where it is un indexed and have too large records til now , and every day it is increase day by day
i don't like to touch the table , but when i do any query it takes minimum 30 minutes to finish
how i do to reduce time of query ?
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