如何合併這三個SQL查詢？

Question

我有三個SQL查詢：

首先查詢：

SELECT DISTINCT  company.company_name AS CompanyName, pts AS CompanyPts 
FROM    users_pts, users_codes, company 
WHERE    scanned = 1 
AND     users_codes.company_id = company.company_id 
AND     users_codes.company_id = users_pts.company_id 
AND     users_codes.email = 'test@gmail.com' 
GROUP BY   company.company_id 

第二個查詢：

SELECT SUM(IF(completed = 0, 1, 0)) AS NumberOfSurveys 
FROM users_survey_answers 
WHERE users_survey_answers.email = 'test@gmail.com' 
GROUP BY users_survey_answers.company_id 

第三個查詢：

SELECT SUM(IF(redeemed = 0, 1, 0)) AS NumberOfRewards 
FROM users_rewards 
WHERE users_rewards.email = 'test@gmail.com' 
GROUP BY users_rewards.company_id 

電子郵件列在所有數據庫，所以不用擔心你從哪裏得到它。 （無論是users_rewards.email還是users_survey_answers.email，沒關係）

我只是需要幫助才能入門。

謝謝你們

Answer 1

它可以與子查詢

select distinct 
    c.company_name as CompanyName, pts as CompanyPts, 
    (
     select sum(if(usa.completed = 0, 1, 0)) 
     from users_survey_answers as usa 
     where 
      usa.email = uc.email and 
      usa.company_id = uc.company_id 
    ) as NumberOfSurveys, 
    (
     select sum(if(ur.completed = 0, 1, 0)) 
     from users_rewards as ur 
     where 
      ur.email = uc.email and 
      ur.company_id = uc.company_id 
    ) as NumberOfRewards 
from users_pts as upusers_codes as uc, company as c 
where 
    scanned = 1 and 
    uc.company_id = c.company_id and 
    uc.company_id = up.company_id and 
    uc.email = 'test@gmail.com' 

來完成它也可以與加入

select distinct 
    c.company_name as CompanyName, pts as CompanyPts, 
    ifnull(usa.NumberOfSurveys, 0) as NumberOfSurveys, 
    ifnull(ur.NumberOfRewards, 0) as NumberOfRewards 
from company as c 
    inner join users_codes as uc on uc.company_id = c.company_id 
    inner join users_pts as up on up.company_id = c.company_id 
    left outer join 
    (
     select 
      t.email, t.company_id, 
      sum(if(t.completed = 0, 1, 0)) as NumberOfSurveys 
     from users_survey_answers as t 
     group by t.email, t.company_id 
    ) as usa on usa.email = uc.email and usa.company_id = uc.company_id 
    left outer join 
    (
     select 
      t.email, t.company_id, 
      sum(if(t.redeemed = 0, 1, 0)) as NumberOfRewards 
     from users_rewards as t 
     group by t.email, t.company_id 
    ) as ur on ur.email = uc.email and ur.company_id = uc.company_id 
where 
    scanned = 1 and 
    uc.email = 'test@gmail.com'