cancel
Showing results for 
Search instead for 
Did you mean: 
Reply
colacan
Helper II
Helper II

Selecting rows with highest value within group using virtual table

Hi,

Curetnly I have ID (duplicated) column only (Group column does not matter). Starting from this column I want to create a table as below

 

ID

Group

Rand_Num

Max_Rand_ID

1

A

0.12

0.66

1

B

0.66

0.66

2

A

0.52

0.98

2

A

0.98

0.98

3

B

0.21

0.45

3

A

0.45

0.45

3

A

0.16

0.45

 

The process I tried is,
1. Generate a 'Rand_Num' column not adding a Colculated column but as DAX variable because I don’t want to increase the file size
2. Create 'Max_Rand by ID' (which is highest Rand_Num within each ID)
3. Iterate the table and filter only Rand() = Max_Rand_ID

 

I've tried it in many ways but I couldn't achieve the desired reault.

For example, 

 

1        EVALUATE
2        VAR Table_rand =
3            ADDCOLUMNS ( Table1, "Rand_Num", RAND () )
4        VAR Table_rand_filtered =
5            FILTER (
6                Table_rand,
7                VAR Ran_Number = [Rand_Num]
8                RETURN
9                    Ran_Number
10                        = CALCULATE (
11                            MAXX(Table_rand,[Rand_Num]),
12                            ALLEXCEPT ( Table1, Table1[ID] )
13                        )
14            )
15        RETURN
16            Table_rand_filtered

 

most of error happend between from 10 to12 rows. 

It gives either only 1 row-table with highest 'Rand_num' or it gives message that it can't access the [Rand_Num]

It seems it can't access [Rand_Num] whenever I use Calculate()  function (row context issue?) while I need it to calculate the highest [Rand_Num] for each ID

 

For me, it is complecated using vertual table which is always confusing in terms of data lineage and accessing its columns. I will appretiate it if you let me know how to solve this problem. (also any articles I can study handling virtual tables)

Thanks.

2 REPLIES 2
colacan
Helper II
Helper II

@amitchandak 

 

 I have ID (duplicated) column only (Group column does not matter). Starting from this column I want to

 

1. Generate a 'Rand_Num' column not adding a Colculated column but as DAX variable because I don’t want to increase the file size
2. Create 'Max_Rand by ID' (which is highest Rand_Num within each ID)
3. Iterate the table and filter only Rand() = Max_Rand_ID

 

==> so I will get unique ID table with highest [Rand_Num]

amitchandak
Super User IV
Super User IV

@colacan , what is the expected output? It is not clear.



Did I answer your question? Mark my post as a solution! Appreciate your Kudos!!
Dashboard of My Blogs !! YouTube Channel !! Connect on Linkedin

Proud to be a Super User!

Helpful resources

Announcements
PBI User Groups

Welcome to the User Group Public Preview

Check out new user group experience and if you are a leader please create your group

April Update

Check it Out!

Click here to read more about the April 2021 Updates!

MBAS Carousel

Sign up for our May 4th event!

May the fourth be with you, join us online!

secondImage

The largest Power BI virtual conference

100+ sessions, 100+ speakers, Product managers, MVPs, and experts. All about Power BI. Attend online or watch the recordings.

Top Solution Authors