Question : Syntax in MS ACCESS SWITCH() when coulumn is NULL

Hello Experts,
I'm getting an error on the column which has a Null value using SWITCH(). Tried to convert it but it seems i've used the wrong syntax. Please help...

Onmy statement below, the error i'm getting is for the last column output (T_Assessment_Score)
SELECT a.Assessment_Rec_ID,
            a.Year_Group,
            a.Surname,
            a.Firstname,
           a.DOB,
           a.Gender,
           a.Form,
           a.Form_Teacher,
           a.Assessment_Period,
           nz(a.Assessment_Score,"IS NULL") as ORIG_rawScore
           c.Category_Doc_ID,
           c.Category_ID,
           SWITCH(
           cstr(a.Assessment_Score)  > 36, "88888",
           cstr(a.Assessment_Score)  < 0, "88888",
           cstr(nz(a.Assessment_Score,"IS NULL")) = 'IS NULL', "99999",
           True, a.Assessment_Score
           ) as T_Assessment_Score  
FROM T_ASSESMENT_MONITORING AS a, T100_MON_CAT_DOC AS c
WHERE a.Assessment_period='2010 Term 3'
And a.Assessment_Category='101'
And a.Form='4/5 M'
And a.Assessment_Category_Doc=c.Category_Document_Description;
 

Answer : Syntax in MS ACCESS SWITCH() when coulumn is NULL

Can you post a mdb/accdb with just the one table?
I tried it in Access 2007, but I suspect it works in 2003 as well.  I had numbers and null fitting each of the 4 switch cases.
Try just this [verbatim] - the Switch for null test (first one below) must appear before all others.

SWITCH(
           a.Assessment_Score&"" = "", "99999",
           a.Assessment_Score  > 36, "88888",
           a.Assessment_Score  < 0, "88888",
           True, a.Assessment_Score
           ) AS T_Assessment_Score
FROM T_ASSESMENT_MONITORING AS a, T100_MON_CAT_DOC AS c
WHERE a.Assessment_period='2010 Term 3'
And a.Assessment_Category='101'
And a.Form='4/5 M'
And a.Assessment_Category_Doc=c.Category_Document_Description;