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New to Tableau so sorry if this is obvious, but I had a hunt and couldn't find/understand anything. So I have a cake shop and I want to know if people have purchased both éclairs and Eccles cakes in the same order

ORDER ID     item 

0001         éclair

0001         iced bun

0001         Eccles cake

0002         éclair 

0002         iced bun

0003         éclair          

0003         Eccles cake   

What I want as an output is the following:

ORDER ID     item          éclair?

0001         éclair          0

0001         iced bun        0

0001         Eccles cake     1

0002         éclair          0

0002         iced bun        0

0003         éclair          0

0003         Eccles cake     1 

I'm thinking it requires something like a lookup or a helper column?!

For reference, I've got a single data set (a csv file) so I'm guessing I can't run a SQL query on it? 

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