Group Rows and Concatenate Each Value of a Specific Column into a String
Problem description & analysis
We have an Excel file Book1.xlsx. Its data is as follows:
| Session |
FirstName |
LastName |
|
Address |
| 1 |
Bob |
Smith |
bob@1.com |
Main Street |
| 2 |
Bob |
Smith |
bob@1.com |
Main Street |
| 4 |
Bob |
Smith |
bob@1.com |
Main Street |
| 1 |
Frank |
Jones |
Frank@2.com |
2nd Street |
| 2 |
Frank |
Jones |
Frank@2.com |
2nd Street |
| 3 |
Frank |
Jones |
Frank@2.com |
2nd Street |
| 4 |
Frank |
Jones |
Frank@2.com |
2nd Street |
| 1 |
Henry |
Andrews |
henry@3.com |
3rd Street |
| 2 |
Henry |
Andrews |
henry@3.com |
3rd Street |
We are trying to group the file by Email and concatenate each Session value into a string by comma. Below is the desired result:
| |
FirstName |
LastName |
Address |
Session |
| Frank@2.com |
Frank |
Jones |
2nd Street |
1,2,3,4 |
| bob@1.com |
Bob |
Smith |
Main Street |
1,2,4 |
| henry@3.com |
Henry |
Andrews |
3rd Street |
1,2 |
Solution
Write the following script p1.dfx in esProc:
| A |
|
| 1 |
=file("Book1.xlsx").xlsimport@t() |
| 2 |
=A1.group(Email;FirstName,LastName,Address,~.(Session).concat@c():Session) |
| 3 |
=file("result.xlsx").xlsexport@t(A2) |
Explanation:
A1 Import the Excel file as a table sequence.
A2 Group the table sequence by Email, retain all columns except for Session, and convert each Session value into a comma-separated string.
A3 Export A2’s result to result.xlsx.
https://stackoverflow.com/questions/63623624/merge-excel-rows-based-on-single-field
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