sql - Using Count and OR giving too high a value -


hi have query want return 1 value. if run query in 2 parts , add them fine when try , or operator value increases.

here first query:

    select count (*) tablename date_tre='2013-10-06' , sector= '1'

this returns 3867

here second:

 select count (*) tablename date_tre='2013-10-06' , sector= '01'

this returns 9

when run using or 

 select count (*) tablename date_tre='2013-10-06' , sector= '1' or sector = '01'

i value of 4066, ideas im wanting figure of 3876

i think because evaluates this

select count (*)  tablename  (date_tre='2013-10-06' , sector= '1') or sector = '01'

when looking this(try one)

select count (*)  tablename  date_tre='2013-10-06' , (sector= '1' or sector = '01')

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