QTP : Import data from a data source at run time

In my Data Sheet, I want to import Data from a data source at run time. The problems are:

1) I go to data sheet and do sheet-->Import-->From Database. Then i write a query to select data. as soon as I finish, the a new column is created and data is fetched from data table. I want this SQL query to get executed only at run time. How do i control when the query gets executed.?

2) Every time, a new column is added to data sheet even if the same column exists. How do I populate the existing columns only?

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