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qsong's avatar
qsong
Helper II
6 years ago
Solved

LOOP to Look up the value in M Query

Hi,   I have a following data table:   I need to create a column called FINAL VALUE with certain rules in the power query editor: - The FINAL VALUE is created based on the COUNTRY - If VA...
Need Help
  • v-alq-msft's avatar
    v-alq-msft
    6 years ago

    Hi, qsong 

     

    Based on your description, I created data to reproduce your scenario. The pbix file is attached in the end.

    Table:

     

    You may go to 'Query Editor'=>'Add Column'=>'Custom Column', input the following codes.

    let
country=[Country],date=[Date],
tab = Table.SelectRows(
    #"Changed Type",
    each [Country]=country and [Date]<date and [Value]<100
)
in 
if Table.RowCount(tab)>0 
then 
   if [Value]>100 
   then Table.Max(tab,"Date")[Value]
   else [Value]
else 
if [Value]<100
      then [Value]
      else 100

     

    Result:

     

    Best Regards

    Allan

     

    If this post helps, then please consider Accept it as the solution to help the other members find it more quickly.

v-alq-msft's avatar
v-alq-msft
Community Support
6 years ago

Hi, qsong 

 

Based on your description, I created data to reproduce your scenario. The pbix file is attached in the end.

Table:

 

You may go to 'Query Editor'=>'Add Column'=>'Custom Column', input the following codes.

let
country=[Country],date=[Date],
tab = Table.SelectRows(
    #"Changed Type",
    each [Country]=country and [Date]<date and [Value]<100
)
in 
if Table.RowCount(tab)>0 
then 
   if [Value]>100 
   then Table.Max(tab,"Date")[Value]
   else [Value]
else 
if [Value]<100
      then [Value]
      else 100

 

Result:

 

Best Regards

Allan

 

If this post helps, then please consider Accept it as the solution to help the other members find it more quickly.

  • Fowmy's avatar
    Fowmy
    Super User
    6 years ago

    Hi v-alq-msft 

    That is a neat solution!

    I am very much interested in improving my M skills; can you direct me to some M language resources for deep learning of the language?

    Thanks
    Fowmy 

     

  • qsong's avatar
    qsong
    Helper II
    6 years ago

    Hi v-alq-msft ,

     

    You answer is very helpful. Thanks a lot.

     

    Best, Qianru