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hello and welcome to this tutorial on merge-join concat and upend now questions on these topics often get asked in interviews and if you somehow evade this topic in the interview and pass it then most probably on the first day I had to work you will be given two or more data sets by our boss and you will be told to join them in a particular way so it is better that you learn how to do that here itself now we will first look at much now pandas merge function will seem quite similar to people who have a sequel background so suppose now we have two data frames a data frame a and a data frame B now there are four types of joining possible inner join outer join left join and right join we will first look at the inner join in inner join what we do is we merge these two datasets together and we find all those rows or all those values which are common to both of them on a particular column which is also called the key column we look into this more detail in a while now we look at outer join n