where子句中的大小写

Question

I want to add constraint to where clause

What I do is this

and case @CCY when 2 then
         not(s1.Number = '810' and s2.Number = '810')
    end

It returns error How to handle this? Thanks in advance

Answer 1

You simply want to get rows where s1.Number and s2.Number are <> 810 (if @CCY=2):

WHERE @CCY <> 2 OR
    NOT ( s1.Number = 810 AND s2.Number = 810 )