mysql操作查詢結果case when then else end用法舉例



舉例1：

使用該查詢，得出iFavoriteID,iFavUserType ,cUser,iArticleID,dFavoriteTime五個字段的值:

SELECT iFavoriteID,
CASE WHEN iFavUserType = 0 THEN '新聞管理員'
WHEN iFavUserType = 1 THEN '商家'
WHEN iFavUserType = 2 THEN '會員'
WHEN iFavUserType = 3 THEN '未註冊'
WHEN iFavUserType = 4 then '匿名'
END AS iFavUserType, cUser, iArticleID,
CONVERT(nvarchar(100), dFavoriteTime, 111) AS dFavoriteTime FROM dig_favorite

舉例2：

SELECT CASE WHEN `MEMBERTYPE` =1
THEN '參賽隊員'
ELSE '指導老師'
END FROM `tab_sign_member`
WHERE 1

select * from gy_goods
where  id in('') and is_spread=1
      AND spreadnum>0
      and (case when spreaddate='2015-11-06' then  alreadyspreadnum < spreadnumoneday else true end)