Challenge #25: Creating Merchant Combos

[TungThanhHo]

my solution

[Kinga]

Hi,

I created the solutions, but my results are slightly different. the reason is easy: According to Use Case we should understand correlation of merchants, so we need also information about those customers who visit only one merchant. However, I do not understand why we should keep lines with nulls where counts are between 2 and 4.

That's why I my solutions I exclude such situations (which is easy to add).

Spoiler

Solution 1:

Solution 2:

[leonhekkert]

Its not the same order as the solution, but the same combinations are present.

Spoiler

[klturi421]

Here's my solution

[saiirangam]

Challenge Completed

[FinnCharlton]

Spoiler

What a weird challenge, found an easy way to do it apart from the (useless imo) nulls, so left it there.

[NicolasSz]

My solution is much easier than the one provided. 

[Linas]

Spoiler

[TimN]

My solution.

[GGailly]

done !