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Note - Read about the JOIN operator here

Question-

File A has:

a11, a12
a21, a22

File B has:

a11, b12
b21, b22

Question

If we run the below commands

A = load 'A' as (f, s);
B = load 'B' as (f, t);
D = join A by f LEFT, B by f;
dump D;

then the output will be

(a11,a12,a11,b12)
(a21,a22,,)

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