mysql操作查询结果case when then用法举例

举例1：

使用该查询，得出iFavoriteID,iFavUserType ,cUser,iArticleID,dFavoriteTime五个字段的值:

SELECT iFavoriteID,
CASE WHEN iFavUserType = 0 THEN '新闻管理员'
WHEN iFavUserType = 1 THEN '商家'
WHEN iFavUserType = 2 THEN '会员'
END AS iFavUserType, cUser, iArticleID,CONVERT(nvarchar(100), dFavoriteTime, 111) AS dFavoriteTime

FROM dig_favorite;

 

举例2：

SELECT a.UNIT,a.NUM_PRICE,a.WEIGHT_PRICE,(case WHEN a.UNIT='1' then a.NUM_PRICE else a.WEIGHT_PRICE end) price
from i_gift_inventory a;

举例3：

select name,birthday,
 case 
     when birthday>'1983' then 'yong'
        when name='lee' then 'handsome'
        else 'just so so ' end
from lee;

 

举例4;

SELECT CASE 1 WHEN 1 THEN 'one'
　　　　　　　　 WHEN 2 THEN 'two' ELSE 'more' END;