mysql操做查询结果case when then else end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'

WHEN iFavUserType = 3 THEN '未注册'

WHEN iFavUserType = 4 then '匿名'

END AS iFavUserType, cUser, iArticleID,

CONVERT(nvarchar(100), dFavoriteTime, 111) AS dFavoriteTime FROM dig_favorite

举例2：

SELECT CASE WHEN `MEMBERTYPE` =1

THEN '参赛队员'

ELSE '指导老师'

END FROM `tab_sign_member`

WHERE 1