MS SQL Server 2008 R2中的CASE错误

Question

I have a query that work in an INSERT statement but not as a stand alone, and for the life of me I can't figure out why. Here's the code that works:

declare @FY1 char(4)
set @FY1 = (DATEPART(yy,DATEADD(m,-2,GETDATE()) ))
declare @fy char(2)
set @fy = SUBSTRING(@fy1,3,2)
declare @MonthUnits char (2)
set @MonthUnits = datepart(mm, dateadd(mm, -2, getdate()))

create table #tmpJDEnbrunits (mcmcu char(12)
        , NbrUnits float
        , mcdl02 char(40))
insert into #tmpJDEnbrunits
select '000' + ltrim(MCMCU)
, CASE @MonthUnits 
WHEN  1 THEN GBAN01/100 -- January
WHEN  2 THEN GBAN02/100 -- February
WHEN  3 THEN GBAN03/100 -- March
WHEN  4 THEN GBAN04/100 -- April
WHEN  5 THEN GBAN05/100 -- May
WHEN  6 THEN GBAN06/100 -- June
WHEN  7 THEN GBAN07/100 -- July
WHEN  8 THEN GBAN08/100 -- August
WHEN  9 THEN GBAN09/100 -- September
WHEN 10 THEN GBAN10/100 -- October
WHEN 11 THEN GBAN11/100 -- November
WHEN 12 THEN GBAN12/100 -- December
  END
, mcdl02 
from [JDEPSQL1\JDEProd].JDE_PRODUCTION.PRODDTA.F0902, 
[JDEPSQL1\JDEProd].JDE_PRODUCTION.PRODDTA.F0006 
where GBMCU = MCMCU and 
GBFY = @fy and GBLT = 'AU' and
GBOBJ = '9900' and GBSUB = '006' and
MCSTYL in ('R') AND MCMCU<'         999' AND 
MCRP22<>'X'

select * from #tmpJDEnbrunits
where NbrUnits > 0

But when I try to run just the SELECT with the CASE to eliminate the temp table, like this:

declare @FY1 char(4)
set @FY1 = (DATEPART(yy,DATEADD(m,-2,GETDATE()) ))
declare @fy char(2)
set @fy = SUBSTRING(@fy1,3,2)
declare @MonthUnits char (2)
set @MonthUnits = datepart(mm, dateadd(mm, -2, getdate()))

select '000' + ltrim(MCMCU)
, CASE @MonthUnits 
    WHEN  1 THEN GBAN01/100 -- January
    WHEN  2 THEN GBAN02/100 -- February
    WHEN  3 THEN GBAN03/100 -- March
    WHEN  4 THEN GBAN04/100 -- April
    WHEN  5 THEN GBAN05/100 -- May
    WHEN  6 THEN GBAN06/100 -- June
    WHEN  7 THEN GBAN07/100 -- July
    WHEN  8 THEN GBAN08/100 -- August
    WHEN  9 THEN GBAN09/100 -- September
    WHEN 10 THEN GBAN10/100 -- October
    WHEN 11 THEN GBAN11/100 -- November
    WHEN 12 THEN GBAN12/100 -- December
  END
, mcdl02 
from [JDEPSQL1\JDEProd].JDE_PRODUCTION.PRODDTA.F0902, 
[JDEPSQL1\JDEProd].JDE_PRODUCTION.PRODDTA.F0006 
where GBMCU = MCMCU and 
GBFY = @fy and GBLT = 'AU' and
GBOBJ = '9900' and GBSUB = '006' and
MCSTYL in ('R') AND MCMCU<'         999' AND 
MCRP22<>'X'

I get the following errors:

Msg 8180, Level 16, State 1, Line 1 
Statement(s) could not be prepared.
Msg 102, Level 15, State 1, Line 1
Incorrect syntax near 'Qry1043'.
Msg 102, Level 15, State 1, Line 1
Incorrect syntax near 'Qry1016'.
Msg 125, Level 15, State 4, Line 1
Case expressions may only be nested to level 10.

The last one is especially odd because the CASE statement has no nesting. Any help will be appreciated, I've been Googling for an hour with no luck!

EDIT: It literally seems to think the WHENs are nested CASE statements. If I comment out any two of them it will run without errors.

Answer 1

You are using some strange auto conversion here or this is not your actual code. If it is your code then do this so you compare strings to strings (not strings to numeric):

CASE @MonthUnits 
    WHEN '01' THEN GBAN01/100 -- January
    WHEN '02' THEN GBAN02/100 -- February
    WHEN '03' THEN GBAN03/100 -- March
    WHEN '04' THEN GBAN04/100 -- April
    WHEN '05' THEN GBAN05/100 -- May
    WHEN '06' THEN GBAN06/100 -- June
    WHEN '07' THEN GBAN07/100 -- July
    WHEN '08' THEN GBAN08/100 -- August
    WHEN '09' THEN GBAN09/100 -- September
    WHEN '10' THEN GBAN10/100 -- October
    WHEN '11' THEN GBAN11/100 -- November
    WHEN '12' THEN GBAN12/100 -- December
  END

Note also, if you really want an number you can use the builtin function MONTH

declare @MonthUnits int
set @MonthUnits = month(dateadd(mm, -2, getdate())

---

aside

I would expect to see that exact error message if your code actually looked like this:

CASE @MonthUnits 
    CASE WHEN '01' THEN GBAN01/100 -- January
    CASE WHEN '02' THEN GBAN02/100 -- February
    CASE WHEN '03' THEN GBAN03/100 -- March
    CASE WHEN '04' THEN GBAN04/100 -- April
    CASE WHEN '05' THEN GBAN05/100 -- May
    CASE WHEN '06' THEN GBAN06/100 -- June
    CASE WHEN '07' THEN GBAN07/100 -- July
    CASE WHEN '08' THEN GBAN08/100 -- August
    CASE WHEN '09' THEN GBAN09/100 -- September
    CASE WHEN '10' THEN GBAN10/100 -- October
    CASE WHEN '11' THEN GBAN11/100 -- November
    CASE WHEN '12' THEN GBAN12/100 -- December
  END

Here you have lots of case statements starting (nested) and no end statement for the case.

Answer 2

Try this code,

CASE 
    WHEN  @MonthUnits = '1' THEN GBAN01/100 -- January
    WHEN  @MonthUnits = '2' THEN GBAN02/100 -- February
    WHEN  @MonthUnits = '3' THEN GBAN03/100 -- March
    WHEN  @MonthUnits = '4' THEN GBAN04/100 -- April
    WHEN  @MonthUnits = '5' THEN GBAN05/100 -- May
    WHEN  @MonthUnits = '6' THEN GBAN06/100 -- June
    WHEN  @MonthUnits = '7' THEN GBAN07/100 -- July
    WHEN  @MonthUnits = '8' THEN GBAN08/100 -- August
    WHEN  @MonthUnits = '9' THEN GBAN09/100 -- September
    WHEN @MonthUnits = '10' THEN GBAN10/100 -- October
    WHEN @MonthUnits = '11' THEN GBAN11/100 -- November
    WHEN @MonthUnits = '12' THEN GBAN12/100 -- December
  END

You will not get "Case expressions may only be nested to level 10." error