Filling a column with Case When Statement in reference to another column - ms-access

Question

I am fairly new to SQL language and I am trying to do some work for Uni in Access. I have three columns: Bindugen, with values shown below, and then blank Columns Code and 33/SDGL:
Bindungen: 33,811, / 811,SDGL,33,/ 33,812,SDGL, / 812,SDGL,/ 811, (etc.)
My main column is Bindungen and I want to fill the others in relation to that one. Basically in the column 33/SDGL I tried to do the Update Case When Statement shown below. It obviously didn't work.
SELECT
FROM Codes;
UPDATE (Codes)
SET 33/SDGL ( CASE
WHEN Bindungen = "*," THEN Allein
WHEN Bindungen = "33,*," Or "*,33," THEN 33
WHEN Bindungen = "SDGL,*," Or "*,SDGL," THEN SDGL
ELSE Both
END);
My goal for the 33/SDGL column is that when Bindungen is: "," = Allein / ",33," Or "33,," = 33 / ",SDGL," Or "SDGL,*," = SDGL
and for the rest = BOTH
Could someone help me write this SQL code?
Also for the Code column, I would like it to find from Bindungen which code is there (eg: 811 or 812). Can someone point me in the right direction?

Answer 1

MS Access does not use the CASE statement. You need to write a SWITCH statement instead, like this:
SWITCH(Bindungen = "*,", Allein, Bindungen = "33,*,", 33, Bindungen = "*,33,", 33,
Bindungen = "SDGL,*,", SDGL, Bindungen = "*,SDGL,", SDGL, BOTH)
Also note that in this situation, Allein, SDGL, and BOTH must ALL be fields that you are selecting from. If you just want the text instead of a field value, wrap those words in "double quotes".