How do I restrict a newly defined date column based one the entire column of the table

[shea]

I want to create a date range for a weekly reporting. I have a table with a defined set of measures from my table. I created a new column with a calculated field. 

New column IS A RANGE OF DATE : Min({<[Last_7_Days]={'1'},[Transaction_Type]={'Points','Redemption'}>} DateKey) & '-' & MAX({<[Last_7_Days]={'1'},[Transaction_Type]={'Points','Redemption'}>}DateKey) 

Here,  I want to select an entire column but the expression would be too long. Any suggestions?! 

[Digvijay_Singh]

Would be great if you can share some sample data or app along with expected output to get more details about the problem context