case statement in where clause?

[janetb]

Can I do the following? Keep getting an error stopping at the first < of the where clause.


declare @mon as int, @yr as int, @myDate as varChar(20)
set @yr=2006
set @mon=1
set @mydate='01/31/2006 23:59:59'

select 0 as DTAP, 0 as DT, 0 as TD, 0 as HIB, 0 as IPV, 0 as MMR, 0 as HEPB, 0 as _VAR, count(v.procedureKey) as FLU, 0 as PPV23, 0 as PCV7, v.chartID, max(rs1.dateService) as dateService from dbo.tbl1 v,
(select distinct dateService, chartID, procedureKey from fhc.dbo.tbl1 where (datePart(year,dateService)=@yr and datePart(month,dateService)=@mon) and (procedureKey='90657' or procedureKey='90658')) as rs1
where (v.chartID=rs1.chartID) and (v.procedureKey=rs1.procedureKey) and
(case when @mon=1 then dateDiff(month,dateService,@myDate)< 216
when @mon=2 then dateDiff(month,dateService,@myDate)<244
when @mon=3 then dateDiff(month,dateService,@myDate)<275
when @mon=4 then dateDiff(month,dateService,@myDate)<305
when @mon=5 then dateDiff(month,dateService,@myDate)<336
when @mon=6 then dateDiff(month,dateService,@myDate)<366
when @mon=7 then dateDiff(month,dateService,@myDate)<32
when @mon=8 then dateDiff(month,dateService,@myDate)<63
when @mon=9 then dateDiff(month,dateService,@myDate)<93
when @mon=10 then dateDiff(month,dateService,@myDate)<124
when @mon=11 then dateDiff(month,dateService,@myDate)<154
when @mon=12 then dateDiff(month,dateService,@myDate)<185
end) group by v.chartID, rs1.procedureKey

[MAK]

case just returns a value. you should give a column name to compare

and mycolumn = (case when @mon=........ end)

[janetb]

I'm a bit confused about how giving the case statement a value and a field name would solve the delima? Perhaps the case statement in the where clause isn't possible, but what would you recommend for dealing with this situation?

[mikr0s]

declare @mon as int, @yr as int,
@myDate as varChar(20) --this could also be datetime
set @yr=2006
set @mon=1
set @mydate='01/31/2006 23:59:59'

select 0 as DTAP, 0 as DT, 0 as TD, 0 as HIB, 0 as IPV, 0 as MMR, 0 as HEPB, 0 as _VAR, count(v.procedureKey) as FLU, 0 as PPV23, 0 as PCV7, v.chartID, max(rs1.dateService) as dateService from dbo.tbl1 v,
(select distinct dateService, chartID, procedureKey from fhc.dbo.tbl1 where (datePart(year,dateService)=@yr and datePart(month,dateService)=@mon) and (procedureKey='90657' or procedureKey='90658')) as rs1
where (v.chartID=rs1.chartID) and (v.procedureKey=rs1.procedureKey) and
dateDiff(month,dateService,@myDate)< CASE WHEN @mon = 1 THEN 216
when @mon=2 THEN 244
when @mon=3 THEN 275
when @mon=4 THEN 305
when @mon=5 THEN 336
when @mon=6 THEN 366
when @mon=7 THEN 32
when @mon=8 THEN 63
when @mon=9 THEN 93
when @mon=10 THEN 124
when @mon=11 THEN 154
ELSE 185 END
group by v.chartID, rs1.procedureKey

--HTH--