Mysql-通过case..when实现oracle decode()函数进行多值多结果判断

oracle的decode函数使用：http://www.cnblogs.com/hwaggLee/p/5335967.html

case ..when 函数使用：http://www.cnblogs.com/hwaggLee/p/5336097.html

mysql解决方案

select

 CASE

     WHEN 字段名称 IS NULL THEN '未知'

     WHEN 字段名称 = '004-001'  THEN '前端'

     ELSE '后端'

 END AS '字段显示名称'from fb_log l ;

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

巴特西

Mysql-通过case..when实现oracle decode()函数进行多值多结果判断

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