电源查询中的特殊 vlookup

Question

感谢您回答我们的问题。看下面的图片。将速率值从第一个范围适当地转移到第二个范围。

Answer 1

如果我理解正确，下面的代码应该可以满足您的要求。

阅读代码注释并探索应用步骤以更好地理解算法。

let

//Read in the lookup table
    Source = Excel.CurrentWorkbook(){[Name="Table1"]}[Content],
    lookupTable = Table.TransformColumnTypes(Source,{
        {"Date", Int64.Type}, 
        {"P Code",Int64.Type}, 
        {"SRC", Int64.Type}, 
        {"Rate", Int64.Type}
        }),

//read in data table
    Source2 = Excel.CurrentWorkbook(){[Name="Table2"]}[Content],
    typeIt2 = Table.TransformColumnTypes(Source2,{
        {"Date", Int64.Type},
        {"P.Code", Int64.Type},
        {"Src", Int64.Type}
        }),

//Join the two tables based on PCode and Src
    join = Table.NestedJoin(typeIt2,{"P.Code","Src"},lookupTable,{"P Code","SRC"},"Joined", JoinKind.LeftOuter),

//for each joined subtable
//   Sort descending by date
//   Select only those rows where the date in table 2 is >= the corresponding date from table 1
//   Then extract the first row Rate value (as that will be the closest to the date in table 2)
    #"Added Custom" = Table.AddColumn(join, "Rate", each Table.SelectRows(Table.Sort([Joined],
        {"Date",Order.Descending}),(t)=> t[Date] <= [Date])[Rate]{0}, Int64.Type),

//Remove unneeded join table column
    #"Removed Columns" = Table.RemoveColumns(#"Added Custom",{"Joined"})

in
    #"Removed Columns"

查找Table

结果

电源查询中的特殊 vlookup

special vlookup in power query

powerquery