我正在使用以下查询:
SELECT
count(tblReplies.repDate) as comReplies,
tblReplies.repDate
FROM tblReplies, tblQuestions, tblUsers
WHERE
tblQuestions.queID = tblReplies.repQuestionID
AND tblQuestions.queCompanyID = tblUsers.uCompanyID
AND tblUsers.uID = tblReplies.repUserID
AND tblUsers.uCompanyID = $comID
AND tblQuestions.queID = $queID
GROUP BY tblReplies.repID
ORDER BY tblReplies.repDate ASC
现在，我正在尝试修改查询以查找 tblQuestions (queID) 中没有回复的帖子(数据库 tblReplies 中没有子项的问题)。任何人都有想法，我完全迷路了，希望那里有忍者:)
谢谢，
最佳答案
select q.*
from tblQuestions q
left outer join tblReplies r on q.queID = r.repQuestionID
where r.repQuestionID is null
关于mysql - SQL 查询 - 查找不存在子帖子的父帖子，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/14532618/