如何从Oracle中检索多个表和列中的数据而不重复？

我试图从3个不同的表中检索不同的数据

我的查询如下所示：

SELECT T.Topic,T.EventNo, T.EventType, T.EventLoc, T.EventDate, T.StartTime, T.EndTime, T.Details, ((ES.SFirstName || ' ' || ES.SLastName))AS SPEAKER
FROM TIMETABLE T
      , EXTERNALSPEAKER ES
      , SPEAKEREVENT SE
WHERE T.EventNo = SE.EventNo 
AND ES.SpeakerID = SE.SpeakerID 
AND EventDate >= SYSDATE
ORDER BY EventDate;

Normalization by Evaluation for Sized Dependent Types   4   Lecture CH.03.024, FLOOR 1
Normalization by Evaluation for Sized Dependent Types   4   Lecture CH.03.024, FLOOR 1
Careers and Employment Information Workshop 1   Workshop    Park Plaza Westminster Bridge Hotel
Object-Oriented Software Design 2   Lecture CH.02.054, FLOOR 3
Doing for our robots what evolution did for us  3   Lecture CH.01.044, FLOOR 4
Doing for our robots what evolution did for us  3   Lecture CH.01.044, FLOOR 4

结果如下所示：

SELECT T.Topic,T.EventNo, T.EventType, T.EventLoc, T.EventDate, T.StartTime, T.EndTime, T.Details, ((ES.SFirstName || ' ' || ES.SLastName))AS SPEAKER
FROM TIMETABLE T
      , EXTERNALSPEAKER ES
      , SPEAKEREVENT SE
WHERE T.EventNo = SE.EventNo 
AND ES.SpeakerID = SE.SpeakerID 
AND EventDate >= SYSDATE
ORDER BY EventDate;

Normalization by Evaluation for Sized Dependent Types   4   Lecture CH.03.024, FLOOR 1
Normalization by Evaluation for Sized Dependent Types   4   Lecture CH.03.024, FLOOR 1
Careers and Employment Information Workshop 1   Workshop    Park Plaza Westminster Bridge Hotel
Object-Oriented Software Design 2   Lecture CH.02.054, FLOOR 3
Doing for our robots what evolution did for us  3   Lecture CH.01.044, FLOOR 4
Doing for our robots what evolution did for us  3   Lecture CH.01.044, FLOOR 4

我已经花了好几个小时，就是想不出来。我是SQL新手

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谢谢大家!

我们得到的信息太少，无法提出明智的建议，所以这里有一个最明显的解决方案：与众不同

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您可能缺少某个连接条件。此外，我建议使用更标准化的联接语法，这样可以更容易地查看缺少哪些列。谢谢，它会得到相同的结果：：很难将发布的输出与发布的查询的投影对齐。它们来自同一个来源吗？不管怎样，这都要归结到数据上。如果您需要我们的帮助，您需要提供样本输入记录，以再现您投诉的问题。