How can I compare records from same dataset

[#1]

I want to compare shopping habits of two customers. A simple data sample data is laid-out

Month	CustomerId	Product Category	Sub Category	Amount Spend
Jan	1	Entertainment	Music	50
Jan	1	Entertainment	Games	50
Jan	1	Electronics	Mobile	500
Jan	1	Electronics	Home	200
Jan	1	Books	Audio	50
Jan	1	Entertainment	Music	20
Feb	2	Entertainment	Music	20
Jan	2	Electronics	Home	300
Jan	2	Books	Audio	50
Jan	2	Books	Hard Copy	20
Jan	2	Entertainment	Music	20
Feb	2	Books	Hard Copy	100
Feb	2	Entertainment	Games	100
Jan	3	Entertainment	Music	150
Feb	3	Entertainment	Games	10

And I want to create a view where I can compare two customers (for a period of time). The view would look something like

Thanks

[#2]

you rock !

[#3]

Petter,

how do I 'escape' a list of dates i.e.

TxnDate={$(=Concat(DISTINCT TxnDate1,','))}

I tried

TxnDate={$(=Concat(DISTINCT TxnDate1,'","'))}

and

TxnDate={"$(=Concat(DISTINCT TxnDate1,','))"}

but they don't seem to work

[#4]

found it

for posterity, you use 'Chr' function. I was messing up the braces.

TxnDate={$(=Concat(DISTINCT Chr(39)&TxnDate1&Chr(39),','))}

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