SQL條件控制（case when...then...else...end） 詳細解釋

   Case具有兩種格式。簡單Case函數和Case搜索函數
   遇到 xxx情況 就 xxx 遇不到就 xxx結束
   case when …… then…… else……end

--簡單Case函數
CASE sex
         WHEN '1' THEN '男'
         WHEN '2' THEN '女'
ELSE '其他' END
--Case搜索函數
CASE WHEN sex = '1' THEN '男'
         WHEN sex = '2' THEN '女'
ELSE '其他' END

select *,
count(CASE WHEN consultType = 1 then 1 end) as count1,
count(CASE WHEN consultType = 0 then 1 end ) as count2,
count(CASE WHEN consultType = 2 then 1 end) as count3
from jcb_users AS ju INNER JOIN jcb_user_consult_record AS jucr where ju.loginUserId=130

我的例子