Question

我有这个查询：

SELECT id from patients_member where id NOT IN
(SELECT msc.member_id 
    FROM journeys_memberstagechallenge msc
    WHERE msc.challenge_id = '2ab9a76c1ad211e7a1350242ac110003'
          AND msc.completed_date IS NOT NULL);

我需要更新此查询，以便它仅具有左联接和条件，以便我的代码生成器可以自动生成它。请帮忙。

Answer 1

您可以尝试以下操作。

SELECT t1.id 
FROM   patients_member t1 
       LEFT JOIN journeys_memberstagechallenge t2 
              ON t2.member_id = t1.id 
                 AND t2.challenge_id = '2ab9a76c1ad211e7a1350242ac110003' 
                 AND t2.completed_date IS NOT NULL 
WHERE  t2.member_id IS NULL

Answer 2

这看起来像：

select pm.id
from patients_member pm left join
     journeys_memberstagechallenge msc
     ON msc.member_id = pm.id and
        msc.challenge_id = '2ab9a76c1ad211e7a1350242ac110003' and
        msc.completed_date is not null
where msc.member_id is null;

第二个表上的条件放在on子句中。 where子句-检查是否匹配-实现not in条件。

转换NOT IN为LEFT JOIN

2 个答案: