sql - Optimize query selecting based on several date ranges -

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it seems there should way make more efficient. difficulty arbitrary date ranges , number of said ranges.

in query attempting retrieve rows tasks table date (regardless of time) 2013-01-01, 2013-01-03, 2013-01-09 or 2013-02-01

tasks  |id        | int      | |begin_date| datetime |  select * tasks (tasks.begin_date >= '2013-01-01' , tasks.begin_date < '2013-01-01')  or (tasks.begin_date >= '2013-01-03' , tasks.begin_date < '2013-01-04')  or (tasks.begin_date >= '2013-01-09' , tasks.begin_date < '2013-01-10')  or (tasks.begin_date >= '2013-02-01' , tasks.begin_date < '2013-02-02')

is there "proper" way this? or more efficient way?

i'm using sql server 2008.

please try this

 select * tasks   convert(varchar,begin_date,103) in  ('01/01/2013','04/01/2013','10/01/2013','02/02/2013')

or can try also.

 select * tasks   (convert(varchar,begin_date,103) ='01/01/2013'   or convert(varchar,begin_date,103) = '04/01/2013'   or convert(varchar,begin_date,103) = '10/01/2013'  or convert(varchar,begin_date,103) = '02/02/2013')

or third way 

 select * tasks  (tasks.begin_date between '2013-01-01' , '2013-01-01')  or (tasks.begin_date between '2013-01-03' , '2013-01-04')  or (tasks.begin_date between '2013-01-09' , '2013-01-10')  or (tasks.begin_date between '2013-02-01' , '2013-02-02')

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