Set Theory + IT question

homeryansta

That won't work if the left set has data that doesn't exist in the right set.

The result I want is a 1-1 relationship where the matching only happens in order

example:

if A{1,1,1,2,2,3,3,3} and B{1,1,2,4}

A B
-- --
1 1
1 1
1 null
2 2
2 null
3 null
3 null
3 null
null 4

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