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

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.

[Jay Coin]

The code I'm using is:

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

But I get:

Answer 1

[Peter Perkins]

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