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In this video tutorial, Rajiv Shadow addresses frequently asked questions about data step merges in programming. He emphasizes the importance of watching the full video to grasp practical examples provided later on. The first question discusses a specific merging program using "data combine merge dataset a dataset b." Since there is no "by" statement, this results in a one-to-one positional merge, meaning the datasets merge based on the variable positions. Consequently, the total number of observations in the output dataset is equal to the size of the larger dataset. Rajiv also references a previous video where multiple set statements were used, leading to a different observation count based on the smaller dataset.