Question

我正在通过mysql内部连接尝试以下组。它说的是未知的列名。你可以帮我解决这个问题。我在内部联接中的“SELECT Min（Id）FROM testinbcalls group by lc.DBID”中收到“查看组中的未知列名DBID”的错误。如果groupby是，我可以修改此查询吗？不允许。我试过“”SELECT Min（Id）FROM testinbcalls WHERE Id = lc.DBID“而不是group by但它没有用。我不希望将检查移动到where子句，因为我希望在内连接本身上过滤记录。任何人都可以帮助我。谢谢

SELECT DISTINCT ic.Id as `Id`,  lc.DBID,
init.Name as Init,
lc.TargetNumber as PhoneNumber, 
CONCAT(us.FirstName,' ',us.Surname) as UserName,
 iout.Name as Outc FROM 
 testcalls ic
 INNER JOIN testinit init on ic.InitId=init.Id
 INNER JOIN users us on ic.UserId=us.Id
 INNER JOIN testinbcalls lc ON ic.Id=lc.CallId AND  lc.DBID IS NOT NULL AND  ic.Id=(**SELECT Min(Id) FROM testinbcalls group by lc.DBID** )
 INNER JOIN (SELECT MIN(Id) Id FROM  testinbcalls  group by lc.DBID) mincallid ON ic.Id=mincallid.Id
 INNER JOIN icomes iout on ic.OutId=iout.Id 
 WHERE ic.AssignedDateTime between '2015-06-08 00:00:00' and '2015-06-09 23:59:59' ORDER BY Id DESC limit 250;

Answer 1

您将其更改为删除表别名lc。有了它，你实际上是在引用外部查询表。

INNER JOIN (SELECT MIN(Id) AS MinId FROM  testinbcalls  group by DBID)

关于group by inside inner join mysql

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