Sql Returning null from second select -


i have query this

select * cars  car_id!=(select car_id reservation reservation_date between '2013-05-13' , '2013-05-15')

i want take car_id='' if nothing between dates it's not working.

first check if returning proper values

select car_id     reservation     reservation_date     between '2013-05-13' , '2013-05-15'

try this:

select *  cars  car_id not in  (    select car_id       reservation       reservation_date between '2013-05-13' , '2013-05-15' )

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