How do I say something equivalent to
.....
WHERE
ColumnA LIKE
CASE
WHEN @Type = 'TWO' THEN N'%' + ' 20-' + N'%'
WHEN @Type = 'THREE_FOUR' THEN N'%' + N' [3-4]0-' + N'%'
WHEN @Type = 'OTHER' THEN ....NOT (N'%' + ' 20-' + N'%') OR (N'%' + N' [3-4]0-' + N'%')
(ie: all others except those defined by the previous two parameters)
END
Any assistance most appreciated.