英文:
Pandas Visual Representation Joining DataFrames
问题
Given these 3 dataframes and the venn diagramm below, one must determine which types of joins are used to get a joined dataframe that represents the venn diagram.
The following image shows the options for merging them. the first two are quite obvious, being inner joins. for the last one the solution states that it is an outer join.
What my question is and what i cannot wrap my head around is, why one would do an outer join. Would that not include the information from students which is not represented in the overlap between it external and staff?
英文:
Given these 3 dataframes and the venn diagramm below, one must determine which types of joins are used to get a joined dataframe that represents the venn diagram.
The following image shows the options for merging them. the first two are quite obvious, being inner joins. for the last one the solution states that it is an outer join.
What my question is and what i cannot wrap my head around is, why one would do an outer join. Would that not include the information from students which is not represented in the overlap between it external and staff?
答案1
得分: 2
你需要考虑 final_df 连接了 student_external 和 student_staff，这是之前操作的结果：
内连接只会给你中心区域（三个集合的交集）。
英文:
You need to take into account that final_df joins student_external and student_staff, the results of the previous operations:
The inner join would only give you the central region (the intersection of all three sets).
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