IF in sql to choose which values to select

I am trying to use an IF or CASE statement in sql to choose when to select a value in a column. Essentially I have some data in a table like so: Sample Data Table

My goal is to see which items are ordered multiple weeks in a row by the same customer. I have 1 month of dates, but I can do 7 separate queries with 1 query for each day of the week. I'm trying to do something like:

Select item, date, customer, truck

    If customer, item combo appears in multiple weeks

Please let me know if you have any idea how I can do this!