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;
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