Join 3 tables based on 2 key fields, trouble using outerjoin()

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newbie9
newbie9 2020-4-6
评论： newbie9 2020-4-6
How can I combine 3 tables into 1 table, using two "key" fields? I have tried various combinations of outerjoin() without any luck. Thanks in advance for any help, I'm sure I'm missing something obvious. Using Matlab R2018a, no fancy add-ons.
Code
%%% set up dummy data tables
Key1 = [1 1 1 2 2 3 3 3 3 3];
Key2 = [1 2 3 1 2 1 2 3 4 5];
Val1 = [0 NaN NaN 0 NaN 0.09 NaN NaN NaN NaN];
Val2 = [NaN 0.55 0.55 0.04 0.04 0.58 0.634 0.668 0.6950 0.7560];
mytable = array2table([Key1', Key2', Val1', Val2']);
mytable.Properties.VariableNames = {'Key1', 'Key2', 'Val1', 'Val2'};
temp1 = array2table([1 4 0; 2 3 0; 3 6 0.09]);
temp1.Properties.VariableNames = {'Key1', 'Key2', 'Val1'};
temp2 = array2table([1 4 0.55; 2 3 0.04; 3 6 0.07560]);
temp2.Properties.VariableNames = {'Key1', 'Key2', 'Val2'};
%%% try to join mytable, temp1, and temp2 together
Tout = outerjoin(mytable, temp1, 'MergeKeys', true);
Tout = outerjoin(Tout, temp2, 'MergeKeys', true);
Current Result
I want the highlighted rows to be combined, such that the Key1-Key2 pair is not duplicated in the output table.
Example Desired Result
  1 个评论
newbie9
newbie9 2020-4-6
Got it-- I just needed to switch the order:
Tout = outerjoin(temp1, temp2, 'MergeKeys',true);
Tout = outerjoin(mytable, Tout, 'MergeKeys',true);

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