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hey guys welcome to my channel this is rajiv shadow and in todays session i am covering most ask questions on data step merge so before start i would request you to please watch the full video because i do not want you to miss practical questions that are mentioned from mid to end okay so lets start here is the first question what type of merging is used in below program data combine merge data set a data set b run so here we are not using a buy statement too much so thats why it is a positional merge so answer is one to one merge it is also called as positional merge because in the above program we are not using buy variable for merging so it will merge both the data sets based on the position of variables total number of observations in output data set would be equal to the largest data set that is used in merge so guys if you remember into the previous video we use multiple set statement to combine the data and there the total number of observations were equal to the lowest obse