tsql - Update from subquery SQL Server 2008 -

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i have tblpatient county name , state name in table. have table both county name , state name , i'm trying normalize tblpatient, structure enter image description here

as can imagine, different states share county names. deal i'm using query

select patientid, admissiondate, dischargedate, patientstate, patientcounty tblpatient patientstate='al'

i'd update tblpatient.patientcounty equal tblstatecounties.countycode patientcounty , countyname same.

i haven't had dummy's version of how use rollback yet, looks correct me, yet don't want committed possibly silly error.

update tblpatient set tblpatient.patientcounty=tblstatecountes.countycode  ( select patientid, admissiondate, dischargedate, patientstate, patientcounty tblpatient patientstate='al' ) t inner join on tblstatecounties.countyname=tblpatient.countyname

the query wrote won't parse (you can check enough) because you're missing clause in sub query.you'd need join on t.tblpatient , you'd need tblpatient in main clause.

you can use query below update table. 

update tblpatient  set    tblpatient.patientcounty = tblstatecounties.countycode    tblpatient         inner join tblstatecounties                 on tblstatecounties.countyname = tblpatient.patientcounty   patientstate = 'al'         , tblstatecounties.statecode = '01';

you'll notice removed subquery , used simple clause. since noted counties can share names need filter tblstatecounties.statecode well

also consider making table mapping of statenames statecode (if don't have already)

demo


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