PowerQuery: Replace Value with Conditional if and the actual Date

Question

Hello,
i have the following problem. I want to update the values of a column with following condition.
#"blabla" = Table.ReplaceValue(#"Table","DateValue1_month","DateValue2_month",Replacer.ReplaceValue,{"column"}),
but i have to check first
if
DateValue1_month < ActualMonth
then
DateValue1_month = ActualMonth
else
keep DateValue1_month
fi
Can some help me with this

Answer 1

I'm a little confused by the question because I can't tell whether DateValue1_month and DateValue2_month represent columns or values. If values, then I'm not sure why they would be quoted in the call to Table.ReplaceValue. Can you flesh out the problem a
little with more-concrete examples?
What I'm guessing is that you want to do something like "if the value in the column is less than ActualMonth then replace it with ActualMonth; otherwise, keep it unchanged." While this kind of operation can be done with Table.ReplaceValue, It's
not straightforward. The problem is that you need to split the logic between a custom replacer function and several literals. If this is what you want to do, I would use Table.TransformColumns and say
Transformed = Table.TransformColumns(table, {"column", each if _ < ActualMonth then ActualMonth else _})