在mysql中查询的情况

Question

我想执行以下查询， 当date diff大于1时，如何在when子句中将其添加为diffdate在那里不可用。

select 
   CASE ( 
SELECT DATEDIFF('2014-11-30','2015-11-29') AS DiffDate
 )
   WHEN 1 THEN "1 Day"
   WHEN 7 THEN "Week"
   WHEN ??? THEN "Yearly"


   END;

Answer 1

使用else

select CASE DATEDIFF('2014-11-30','2015-11-29')
            WHEN 1 THEN '1 Day'
            WHEN 7 THEN '7 Days'
            ELSE 'Yearly'
       END;