Problems with the CASE structure - response (3) by ulrich

Hi,
T1 = TRIM(TRAILING FROM Str1)
type(TRIM(TRAILING FROM Str1) ) states that this is a varchar(10) - so you put in a char(10) and convert it to a varchar(10).
-> LT1 = CHARACTER_LENGTH(T1) = 0
Now your case:

CASELT1

       WHEN0 -> TRUE -> Str1 -> CHAR(10) which is TStr1

-> CHARACTER_LENGTH(TStr1) = 10

so to me everything is as expected and no issue...

You chose the implicited casted varchar(10) for your condition but the original value for your furthe processing and these are different.