sql中，case when的几种写法

           Province = 
            CASE 
                WHEN DCCity = '商丘' THEN '河南'
                WHEN DCCity <> '商丘' THEN '非河南'
            END, 

 case ISNeed 
                when '1' then '10' 
                when '0' then '20' 
  end as TotalFreight