Hi,
I have a fact table of sales and I need to get 2 new columns, wich will display Previous date of purchase and Previous sales status (both red in the table below).
I'm trying to get same results as with using lag/window function in SQL ( lag(date_of_purchase) over (partition by month_of_sale, customer, product order by date_of_purchase).
Also, the problem is, I no longer can edit Query (the table in database no longer exists)..
| month of sale | customer | product | sales status | date of purchase | previous date of purchase | previous sales status |
| Dec-16 | john | A | booked | 01-12-16 | null | null |
| Dec-16 | john | A | booked | 20-12-16 | 01-12-16 | booked |
| Dec-16 | alicia | A | paid | 01-12-16 | null | null |
| Jan-17 | john | Ck111 | booked | 01-01-17 | null | null |
| Jan-17 | john | Ck111 | paid | 13-01-17 | 01-01-17 | booked |
| Jan-17 | john | A | booked | 01-01-17 | null | null |
| Jan-17 | john | A | booked | 03-01-17 | 01-01-17 | booked |
| Jan-17 | alicia | Ck111 | booked | 01-01-17 | null | null |
| Jan-17 | alicia | Ck111 | paid | 13-01-17 | 01-01-17 | booked |
| Jan-17 | alicia | Ck111 | paid | 20-01-17 | 13-01-17 | paid |
I've been trying to use calculate function with filters, but so far no useful results. I'm new at DAX, so probably I'm not using them right way..
Thanks in advance for any help!
Zuzana