I have this select
statement and what I am trying to accomplish is to get data in the
DosagePerUnits
column only if Dosage
is not equal to empty or 1 and if Units
is not empty or 1.
Can someone help me please ?
select
sbd.Code, c.Description, sbd.Dosage,
Case
when sbd.Units = '' then '1'
else sbd.Units
end as Units,
ad.ApptDate, sbd.RCycle, sbd.RWeek, sbd.RDay,
t.HistoryOrder, t.TypeId, sbd.Dosage + '/' + sbd.UnitsAS DosagePerUnits
from
bill_SuperBillDetail sbd,
bill_ProcedureVerification pv,
AppointmentData ad,
CPTCode c,
CPTType t
where
sbd.AccessionNumber = pv.AccessionNumber
and pv.ApptId = ad.ApptId
and ad.PatientId = 443
and ad.ApptDate <= GETDATE()
and ad.ApptDate > '2009-11-15 00:00:00.000'
and c.TypeId = t.TypeId
According to your description, it should be like this:
CASE WHEN ISNULL(sbd.Dosage, '1') <> '1' AND ISNULL(sbd.Units, '1') <> '1' THEN
sbd.Dosage + '/' + sbd.Units
ELSE NULL END AS DosagePerUnits
ISNULL(x, 1)
replaces x with 1 if it is null. So ISNULL(x, 1)
is = 1 if x is either 1 or NULL.
EDIT: Changed to the assumption that [Dosage] and [Unit] are both varchar as your comment indicates.
如果sbd.Units =''则为Case,而不是Case,否则sbd.Units以Units结尾,请尝试Coalesce(sbd.Units,1)作为Units,
If any part of the calculation is null the whole thing will be null. You can use this fact this way:
nullif(nullif(sbd.Dosage, ''), '1') + '/' + nullif(nullif(sbd.Units, ''), '1') AS DosagePerUnits
This will result in DosagePerUnits being null when one of the columns are '', '1' or null
I thought i had a really clever answer here. Oh well, I guess it wasn't that clever. Does anyone know why I am unable to write comments ?
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