After appending, I get null values in primary table headers

Question

I have a table that I want to use as headers for another table that just has data. I used append as new in PBI, used the headers table as primary and data table as secondary. All the columns from the primary table have null values and the data table is appended next to headers column.

Eg:

Table 1 ( Headers)

+-----+-----+-----+-----+
| ABC | DEF | IGH | KLM |
+-----+-----+-----+-----+

Table 2 ( Data )

+----+----+----+----+
|  1 |  2 |  3 |  4 |
|  6 |  7 |  8 |  9 |
| 11 | 12 | 13 | 14 |
| 16 | 17 | 18 | 19 |
| 21 | 22 | 23 | 24 |
| 26 | 27 | 28 | 29 |
| 31 | 32 | 33 | 34 |
+----+----+----+----+

Table I am getting after append:

+------+------+------+------+------+------+------+------+
| ABC  | DEF  | IGH  | KLM  | null | null | null | null |
+------+------+------+------+------+------+------+------+
| null | null | null | null |    1 |    2 |    3 |    4 |
| null | null | null | null |    6 |    7 |    8 |    9 |
| null | null | null | null |   11 |   12 |   13 |   14 |
| null | null | null | null |   16 |   17 |   18 |   19 |
| null | null | null | null |   21 |   22 |   23 |   24 |
| null | null | null | null |   26 |   27 |   28 |   29 |
| null | null | null | null |   31 |   32 |   33 |   34 |
+------+------+------+------+------+------+------+------+

Table I need:

+-----+-----+-----+-----+
| ABC | DEF | IGH | KLM |
+-----+-----+-----+-----+
|   1 |   2 |   3 |   4 |
|   6 |   7 |   8 |   9 |
|  11 |  12 |  13 |  14 |
|  16 |  17 |  18 |  19 |
|  21 |  22 |  23 |  24 |
|  26 |  27 |  28 |  29 |
|  31 |  32 |  33 |  34 |
+-----+-----+-----+-----+

I used Append as new in PBI Used the headers table ( Table 1) as primary and appended Table 2 to it.

This shows at the top function:

= Table.Combine({Table 1, Table 2})

This in the advanced editor:

let
    Source = Table.Combine({Sheet1, InterviewQn})
in
    Source

Expected result:

+-----+-----+-----+-----+
| ABC | DEF | IGH | KLM |
+-----+-----+-----+-----+
|   1 |   2 |   3 |   4 |
|   6 |   7 |   8 |   9 |
|  11 |  12 |  13 |  14 |
|  16 |  17 |  18 |  19 |
|  21 |  22 |  23 |  24 |
|  26 |  27 |  28 |  29 |
|  31 |  32 |  33 |  34 |
+-----+-----+-----+-----+

OR

+-----+-----+-----+-----+
| ABC | DEF | IGH | KLM |
| 1   | 2   | 3   | 4   |
| 6   | 7   | 8   | 9   |
| 11  | 12  | 13  | 14  |
| 16  | 17  | 18  | 19  |
| 21  | 22  | 23  | 24  |
| 26  | 27  | 28  | 29  |
| 31  | 32  | 33  | 34  |
+-----+-----+-----+-----+

Answer 1

If you're only trying to rename the columns of Table 2, using the column names of Table 1, then it's simply:

= Table.RenameColumns(#"Table 2", List.Zip({Table.ColumnNames(#"Table 2"), Table.ColumnNames(#"Table 1")}))

See https://pwrbi.com/so_55529969/ for worked example PBIX file