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Hello everyone,
I have a questions about a complex merge I need to do in Power Query.
Imagine the following tables:
Table1:
Column1 | Column2
1 4441
2 4442
3 4443
4 443
Then I have Table2 , as the following table:
Table2:
Column1 | Column2
1 4441098
2 4441097
3 4441011
4 4441122
5 4443111
6 4443123
And the merge should have the rows of Table1 and the rows of Table2 where the "prefix" of Table2.Column2 is Table1.Column2. Take into account that I do not know the number of chars of the prefix, I mean, Table1.Column2 can have any lenght not greater than 7
Regards GV
Solved! Go to Solution.
A different way to perform a lookup is to use "Table.SelectRows", although this might be slower - so it is essential that you use the Table.Buffer and for very large table try to partition also. But the basic principle can look as follows:
let Table1 = Table.Buffer(#table({"Column1", "Column2"}, {{1, "4441"}, {2, "4442"}, {3, "4443"}, {4, "443"}})), Table2 = #table({"Column1", "Column2"}, {{1, "4441098"}, {2, "4441097"}, {3, "4441011"}, {4, "4441122"}, {5, "4443111"}, {6, "4443123"}}), Lookup = Table.AddColumn(Table2, "Lookup", (outer) => Table.SelectRows(Table1, each Text.StartsWith(outer[Column2], [Column2]))), #"Expanded Lookup" = Table.ExpandTableColumn(Lookup, "Lookup", {"Column2"}, {"Lookup.Column2"}) in #"Expanded Lookup"
Advantage here is that you don't need an exact match, but can use all sorts of conditions, in this case "Text.StartsWith".
Imke Feldmann (The BIccountant)
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