Unable to outerjoin two tables, Error message of 'Left and right key variables have incompatible types'

Question

Jay Coin 2024-5-19

0
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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/2120341-unable-to-outerjoin-two-tables-error-message-of-left-and-right-key-variables-have-incompatible-typ

回答： Peter Perkins 2024-5-29

Hi, it seems that no matter what I try, my left and right key variables will always be of incompatible types.

It's gotten so frustrating that I literally renamed Table A to have the exact same category names as Table B.

For example, each Table now has the same categories, One, Two, Three, Four, Five, and Six

But for some reason, matlab.mathworks.com keeps saying that 'Ordinal arrays must have the same categories, including their order' - which I believe I already made sure the tables were.

Dear community, what exactly am I doing wrong? Is MATLAB Online not compatible with joining tables?

My version is 2024a - Thanks.

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Jay Coin 2024-5-19

编辑：Jay Coin 2024-5-19

The code I'm using is:

newTaxiALL = outerjoin(TableA,TableB,"Type","left","LeftKeys",["One","Two"],"RightKeys",["One","Two"],"MergeKeys",true);

But I get:

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Answer 1

Peter Perkins 2024-5-29

0
链接

此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/2120341-unable-to-outerjoin-two-tables-error-message-of-left-and-right-key-variables-have-incompatible-typ#answer_1464916

在 MATLAB Online 中打开

Jay, it's impossible to know what you are doing from what you've posted. outerjoin does work with ordinal key variables, so you will need to post more information.

x = [1;2;3];
g1 = categorical(["a";"b";"b"],Ordinal=true);
g2 = categorical(["c";"c";"d"],Ordinal=true);
t1 = table(x,g1,g2)
t1 = 3x3 table
    x    g1    g2
    _    __    __

    1    a     c 
    2    b     c 
    3    b     d 
y = [4;5;6];
g1 = categorical(["a";"a";"b"],Ordinal=true);
g2 = categorical(["c";"d";"d"],Ordinal=true);
t2 = table(y,g1,g2)
t2 = 3x3 table
    y    g1    g2
    _    __    __

    4    a     c 
    5    a     d 
    6    b     d 
outerjoin(t1,t2,"Type","left","LeftKeys",["g1","g2"],"RightKeys",["g1","g2"],"MergeKeys",true)
ans = 3x4 table
    x    g1    g2     y 
    _    __    __    ___

    1    a     c       4
    2    b     c     NaN
    3    b     d       6