📊[DataCamp] Pandas판다스 : Left Join, Other Joins, Merging a table to itself, Merging on indexes

 

 Right Table에는 있지만 left Table에 없는 Row의 Cell은 합치지 않고, 누락된다! 

 

📌Left Join vs. Inner join example

 

Rows 

 

 

 

 

 

📌How to count number of rows that are missing  .isnull().sum()

 

 

 

 

 

 

 

 

 

 

 

 

📌 Right Join <-> Left Join 

 

 

 

 

📌 left_on="", right_on=""

 

 

📌 Outer Join

 

 

📌Merging a table to itself 

 

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Merging on indexes