Replace null date with date data from another column

[keen]

Hi Team , 

This is BI power query,

I am looking for a solution , need formula to replace "null " to date promised data if original promise date is null or no information. 

I am trying the add column> conditional column , but it does'nt t work , error.

Regards, Keen

[keen]

@Ahmedx  thanks for your sharing, the code is very helpful 🙂

[Ahmedx · Accepted solution]

if my code solved your problem, accept it as a solution

[Ahmedx]

pls try this code

let
    Source = Table.FromRows(Json.Document(Binary.Decompress(Binary.FromText("Zc7JDcAgDATAXvxGyAfhqAXRfxsQ8Yg3lvxhZ20xJ7HkM8pqlIh7Zr2PlY6pt4FmzoTRijdBe5zdpIak+f2C+z20h29XaL8f+6yhyf+SaEgMkrUB", BinaryEncoding.Base64), Compression.Deflate)), let _t = ((type nullable text) meta [Serialized.Text = true]) in type table [#"Date Promised" = _t, #"Original Promise Date" = _t]),
    #"Changed Type" = Table.TransformColumnTypes(Source,{{"Date Promised", type date}, {"Original Promise Date", type date}}),
    #"Replaced Value" = Table.ReplaceValue(#"Changed Type",null, (x)=>x[Date Promised], (x,y,z)=>  if x = null then z else x,{"Date Promised","Original Promise Date"})
in
    #"Replaced Value"