Mysql 有点混乱，还有一个音符。在将ProfileRelations表连接回Profile表时，可能存在一个关系，但我特别需要查看字段OrgInd='1'，因为其他任何内容都是雇员。我需要查看标记为“仅组织”的记录。 select p.ProfileId, p.O

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有点混乱，还有一个音符。在将ProfileRelations表连接回Profile表时，可能存在一个关系，但我特别需要查看字段OrgInd='1'，因为其他任何内容都是雇员。我需要查看标记为“仅组织”的记录。

select p.ProfileId, p.OrgInd, p.OrgName, p1.OrgInd, p1.ProfileId
from profile as p inner join
ProfileRelations as pa on p.ProfileId = pa.ProfileID inner join
profile as p1 on p1.ProfileId = pa.RelProfileID

select p.ProfileId, p.OrgInd, p.OrgName, p1.OrgInd, p1.ProfileId
from profile as p 
        inner join
     ProfileRelations as pa 
        on p.ProfileId = pa.ProfileID 
where pa.RelProfileID not in (select ProfileId from profile);

SELECT p.ProfileId, p.OrgInd, p.OrgName, p1.OrgInd, p1.ProfileId
FROM profile as p 
LEFT join ProfileRelations as pa 
   on p.ProfileId = pa.ProfileID 
LEFT join profile as p1 
  on p1.ProfileId = pa.RelProfileID
WHERE PA.ProfileID is null

SELECT p.ProfileId, p.OrgInd, p.OrgName
FROM profile as p 
WHERE NOT EXISTS (SELECT * 
                  FROM ProfileRelations as pa 
                  WHERE p.ProfileId = pa.ProfileID) 

select *
from profile
where ProfileId not in (select ProfileID from ProfileRelations)
  and ProfileId not in (select RelProfileID from ProfileRelations);

select *
from profile p
where not exists
(
  select *
  from ProfileRelations pr
  where p.ProfileId in (pr.ProfileId, pr.RelProfileID)
);

select *
from profile p1
join profile p2 on p2.ProfileID <> p1.ProfileID
where not exists
(
  select *
  from ProfileRelations pr
  where (pr.ProfileId = p1.ProfileId and pr.RelProfileID = p2.ProfileId)
     or (pr.ProfileId = p2.ProfileId and pr.RelProfileID = p1.ProfileId)
);