Merge Table¶
Merge tables on a shared index column
Documentation¶
Merge table on a shared index column in input A and input B.
A specific index can be present in either A or B, or in both A and B. The join operation determines which rows to include in the output.
Intersection, output rows in A x B (cartesian product), where the two indices match. Corresponds to an intersection of indices from both A and B.
Index from A, output rows with index present in A and not in B. Also includes the intersection.
Index from B, output rows with index present in B and not in A. Also includes the intersection.
Union, output the rows for index from A, index from B and the intersection (once). Corresponds to a union of indices from both A and B.
Output contains the index column (once) and one additional column for each column in A and in B. Column names, except the index, that appear in both A and B are made unique by adding a suffix. Rows with an index that is only present in either of A or B will contain masked values (or NaN) in columns missing data.
Example¶
- Suffix A
_A
- Suffix B
_B
- A
Id |
Price |
Inventory |
|---|---|---|
0 |
10 |
5 |
1 |
15 |
0 |
2 |
25 |
2 |
- B
Id |
Sold |
Price |
|---|---|---|
1 |
1 |
10 |
1 |
4 |
15 |
2 |
3 |
25 |
3 |
1 |
45 |
- Intersection
Id |
Price_A |
Inventory |
Sold |
Price_B |
|---|---|---|---|---|
1 |
15 |
0 |
1 |
10 |
1 |
15 |
0 |
4 |
15 |
2 |
25 |
2 |
3 |
25 |
- Index from A
Id |
Price_A |
Inventory |
Sold |
Price_B |
|---|---|---|---|---|
0 |
10 |
5 |
NaN |
NaN |
… 3 intersection rows |
||||
- Index from B
Id |
Price_A |
Inventory |
Sold |
Price_B |
|---|---|---|---|---|
… 3 intersection rows |
||||
3 |
NaN |
NaN |
1 |
45 |
- Union
Id |
Price_A |
Inventory |
Sold |
Price_B |
|---|---|---|---|---|
0 |
10 |
5 |
NaN |
NaN |
… 3 intersection rows |
||||
3 |
NaN |
NaN |
1 |
45 |
Definition¶
Input ports¶
- Input A table
Input A
- Input B table
Input B
Output ports¶
- Output table
Output
Configuration¶
- Index column (index)
Index to join on, should exist in both input A and B.
- Join operation (operation)
Join operation, determines which rows to output.
- Suffix A (suffix_a)
Suffix for column names in A appearing in both A and B.
- Suffix B (suffix_b)
Suffix for column names in B appearing in both A and B.
Examples¶
Implementation¶
- class node_merge_tables.MergeTable[source]
