sql server - SQL test empty string -


i have query. want to
records in date range -> done records priorsurgery = 'yes' -> done records consultant not blank - not working

how test no blank.
ive tried and adm.adm_consultant != ''
ive rried and adm.adm_consultant <> ''

and 1 below (which looks better way it)

where going wrong?

select adm.adm_consultant, adm.adm_priorsurgery admission adm  adm.adm_referraldate >= '01/01/2014 00:00:00' , adm.adm_referraldate <= '31/12/2014 00:00:00'   , adm.adm_priorsurgery = 'yes', , length(adm.adm_consultant) > 0

if values null then

select adm.adm_consultant, adm.adm_priorsurgery admission adm  adm.adm_referraldate >= '01/01/2014 00:00:00' , adm.adm_referraldate <= '31/12/2014 00:00:00'   , adm.adm_priorsurgery = 'yes' , adm.adm_consultant not null

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