Understanding Complex Query Scenarios: A Step-by-Step Approach to Searching Multiple Dataframes Based on Custom Order

Calculating Total Hours Worked Across Multiple Rows for a Single Day in SQL

Comparing Non-Nested Linear Models Using the Vuong Test

The problem statement wasn't provided, but based on the given response, it seems that the task is to provide a detailed explanation of how to merge two or more dataframes using the `merge()` function from R.

Comparing DataFrames Cell by Cell Without Using Loops in R