How to group columns with an odd index, based on columns with an even index? [closed]

Closed 7 hours ago.

How to group columns with an odd index, based on columns with an even index? [closed]

Closed 7 hours ago.

Transform a column into a comma-separated concatenated string by group

Data:

Transform a column into a comma-separated concatenated string by group

Data:

Transform a column into a comma-separated concatenated string by group

Data:

Transform a column into a comma-separated concatenated string by group

Data:

Transform a column into a comma-separated concatenated string by group

Data:

tag many-to-many relationship when using left_join in dplyr

Is there a method(s) to tag “many-to-many、one-to-many and many-to-one” relationship, like in the example below?

tag many-to-many relationship when using left_join in dplyr

Is there a method(s) to tag “many-to-many、one-to-many and many-to-one” relationship, like in the example below?

tag many-to-many relationship when using left_join in dplyr

Is there a method(s) to tag “many-to-many、one-to-many and many-to-one” relationship, like in the example below?