Using the outerjoin to join more than 2 tables

I want to join multiple tables together to make one table. I've used the outerjoin function to join 2 tables together(shown below). Is there anyway to join more than 2 tables using the outerjoin function.
c = outerjoin(data{1,1},data{1,3},'Keys','time','MergeKeys',true);

2 件のコメント

Jan
Jan 2018 年 1 月 30 日
No, you did not use the outerjoin function, but the join function.
Mark Rodger
Mark Rodger 2018 年 1 月 30 日
Yeah, meant to say join instead of outerjoin

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回答 (1 件)

Jan
Jan 2018 年 1 月 30 日
編集済み: Jan 2018 年 6 月 8 日

0 投票

You can nest the joining:
outerjoin(A, outerjoin(B, C))
[EDITED] With a loop:
function Joined = MultiOuterJoin(varargin)
Joined = varargin{1};
for k = 2:nargin
Joined = outerjoin(Joined, varargin{k});
end
end

3 件のコメント

Nick George
Nick George 2018 年 6 月 7 日
編集済み: Nick George 2018 年 6 月 7 日
is this a joke? this is the best solution matlab offers for a very common operation? This answer https://www.mathworks.com/matlabcentral/answers/404380-outer-join-of-multiple-tables is nicer than nesting... but it is still a loop. Both python and r allow passing lists of data frames/tables as an argument to *_join.. I am surprised..
Jan
Jan 2018 年 6 月 8 日
編集済み: Jan 2018 年 6 月 8 日
@Nick George: No, I'm not joking. All I did was to show, that it is easy to call outerjoin multiple times. If this is done recursively of by a loop does not matter, because the point is the iterative joining.
See EDITED.
Devin kIM
Devin kIM 2020 年 11 月 9 日
I gotta agree with Nick on this one... This can be done in virtually all analysis languages, why is joining multiple tables not available in 2020b? Seems like something that should have been available a long time ago instead of adding more flashy features...

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