How to convert SQL query to Power BI DAX query?

Question

Desired Output

Hi, i want to convert my sql query to a DAX measures for to filter all that have Rank 1 only. I've been trying to use RankX(Filter) but I get duplicate ranks. Thank you

row_number() over (partition by date,customer, type order by day)

 
┌──────────┬──────────┬─────┬──────┬──────────────┬
│ Day      │ Customer │ Day │ Type │ Desired Rank │
├──────────┼──────────┼─────┼──────┼──────────────
│ 6/1/2020 │ DDD      │   1 │ D    │            1 │
│ 6/1/2020 │ DDD      │   0 │ M    │            1 │
│ 6/1/2020 │ DDD      │   1 │ D    │            2 │
│ 6/1/2020 │ DDD      │   0 │ M    │            3 │
│ 6/1/2020 │ FFF      │   0 │ M    │            1 │
│ 6/1/2020 │ FFF      │   0 │ M    │            2 │
│ 6/1/2020 │ FFF      │   0 │ M    │            3 │
│ 6/1/2020 │ FFF      │   0 │ M    │            4 │
│ 6/1/2020 │ BBB      │   1 │ D    │            1 │
│ 6/1/2020 │ BBB      │   0 │ M    │            1 │
│ 6/1/2020 │ BBB      │ 0   │ M    │            2 │ 
│ 6/1/2020 │ BBB      │ 0   │ M    │            3 │
│ 6/2/2020 │ FFF      │ 2   │ D    │            1 │
│ 6/2/2020 │ BBB      │ 2   │ D    │            1 │
│ 6/3/2020 │ FFF      │ 3   │ D    │            1 │ 
│ 6/3/2020 │ FFF      │ 3   │ D    │            2 │
│ 6/3/2020 │ FFF      │ 3   │ D    │            3 │
│ 6/4/2020 │ DDD      │ 4   │ D    │            1 │
│ 6/4/2020 │ DDD      │ 4   │ D    │            2 │
│ 6/4/2020 │ DDD      │ 4   │ D    │            3 │
│ 6/4/2020 │ FFF      │ 4   │ D    │            1 │
│ 6/4/2020 │ FFF      │ 4   │ D    │            2 │
│ 6/5/2020 │ EEE      │ 5   │ D    │            1 │
│ 6/5/2020 │ EEE      │ 5   │ D    │            2 │
│ 6/5/2020 │ DDD      │ 5   │ D    │            1 │
│ 6/5/2020 │ DDD      │ 5   │ D    │            2 │
│ 6/5/2020 │ DDD      │ 5   │ D    │            3 │
│ 6/5/2020 │ FFF      │ 5   │ D    │            1 │
└─────────────────────┴─────┴──────┴──────────────┘

Answer 1

Follow this following steps to achieve your required output.

Step-1: Go to Power Query Editor and Add a index column to your table as shown in the below image. This is required as you have same value in multiple row for date,customer, type combination. I tried but found unexpected RANKX is generating for having same value in all rows for a group. For this reason Index column is created.

Index column is created to keep different value in each row just. No other purpose is there for this column.

Step-2: Get back to your report by clicking "Close & Apply" button.

Step-3: Now create a custom column in your table with this following code-

group_wise_rank = 

RANKX (
    FILTER (
        'your_table_name',
        'your_table_name'[Date] = EARLIER ('your_table_name'[Date])
            && 'your_table_name'[Customer] = EARLIER ('your_table_name'[Customer])
            && 'your_table_name'[Type] = EARLIER ('your_table_name'[Type])
    ),
    'your_table_name'[Index],
    ,
    ASC
)

This tricks should work for you.