How do I get two distinct column values ?

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SQL

T-SQL

I have three columns named as CustomerID int, PurchaseID int, PaymentDate datetime.

each CustomerID can have multiple PurchaseIDs and Payment will be done multiple times a day.
my table data looks like as below:
[C_ID P_ID P_Date]
[c1 p1 01/01/2017]
[c2 p2 01/01/2017]
[c2 p2 01/01/2017]
[c2 p2 02/01/2017]
[c2 p3 02/02/2017]
[c3 p4 10/10/2017]

I'm trying to display distinct dates and distinct P_IDs.
for example for CustomerID c2: Display only
[c2 p2 01/01/2017]
[c2 p2 02/01/2017]
[c2 p3 02/02/2017]
these results in result table.

Could you please help me with this.
Thank you.

What I have tried:

select distinct(C_ID), * from mytable

but it doesn't gives the expected results.