What is the process of connecting two datasets by appending rows and aligning corresponding columns called?

The correct term for the process of connecting two datasets by appending rows while aligning corresponding columns is known as a Union. In the context of data manipulation, a Union operation combines two or more datasets into a single dataset by stacking them on top of each other. This requires that the datasets have the same structure, meaning the columns must match in both data type and order.

When datasets are combined using a Union, it’s essential that they are compatible; otherwise, the operation cannot be completed. This method is commonly used to consolidate data from different sources or periods while maintaining a uniform format across the combined dataset.

Other terms such as Join and Merge are typically associated with combining datasets side by side based on a common key or column, while Stack refers more to the arrangement of data rather than the process of combining datasets. Thus, Union is the most appropriate term to describe the operation of appending rows while aligning columns.