Decide on a suitable time for them both to start and then in one window run this
WAITFOR TIME '13:00:00'
select * from table1
and run this in the other
WAITFOR TIME '13:00:00'
select * from table2
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Deja View - The strange feeling that somewhere, sometime you've optimised this query before
How to get the best help on a forum
http://www.sqlservercentral.com/articles/Best+Practices/61537