Reference a a column for a list in Power Query

[gianmarco]

Dear All,

I have the following table:

Table1

CODE	VALUE
724	1.000
323	500
null	200
455	300
null	1.200
444	600
256	700

Through the following step in PowerQuery:

= Table.TransformColumns( #"previous step", {{"CODE", (x)=> if x = null then List.Select(List.Distinct( #"previous step"[CODE]), each _<> null) else {x}}})

I achieve the following:

in column CODE, replace "null" with a list of all the distinct codes existent in column CODE except "null".

In this way, instead of nulls, I get a list of the following elements {724, 323, 455, 444, 256} 

Now, I have another table with a list of codes:

Table2

CODE	VALUE
123	100
829	100
047	150
299	300

My question is: How do I reference CODE column in Table 2 in the previous step INSTEAD of CODE column in Table1?

Thank you for your time

gianmarco

[Ahmedx · Accepted solution]

pls try this

https://1drv.ms/u/s!AiUZ0Ws7G26RikftCgPDNUaUgfXR?e=VnFtgQ

[Ahmedx]

https://1drv.ms/u/s!AiUZ0Ws7G26RikjbzuTtVvbrW4lz?e=bLEBIR

[Ahmedx]

write the expected result, it’s not clear what you want

[gianmarco]

Dear @Ahmedx ,

consider I have the following tables:

Table1

CODE	VALUE
724	1.000
323	500
null	200
455	300
null	1.200
444	600
256	700

Table2

CODE	VALUE
123	100
829	100
047	150
299	300

My expected result is:

replace nulls in table 1 with a list containing the elements of table 2. In this case: {123,829,047,299}

[Ahmedx · Accepted solution]

pls try this

https://1drv.ms/u/s!AiUZ0Ws7G26RikftCgPDNUaUgfXR?e=VnFtgQ

[gianmarco · Accepted solution]

Dear @Ahmedx ,

it seems that your formula si replacing not only the "nulls" in CODE column but all the elements instead.

I think I need to change this formula which i'm actually using:

= Table.TransformColumns( #"previous step", {{"CODE", (x)=> if x = null then List.Select(List.Distinct( #"previous step"[CODE]), each _<> null) else {x}}})

This formula is actually replacing the nulls in code columns with a list of all the CODEs in Code column except null in TABLE1.

[Ahmedx]

it is possible, but my code essentially it only changes null

[gianmarco]

Ah, you're right!

Gonna give it a try, then mark your answer as solution 🙂