Merge queries is one way to combine queries (or even different tables within the same query) in Power Query/M. Combining two data sets with each other can be done in multiple ways. One of the ways of combining data sets with each other is Merging data sets. Merge is similar to Join in relational databases. Merging two data sets with each other requires some joining fields, and the result will be a combined set of columns from both data sets. Append means results of two (or more) queries (which are tables themselves) will be combined into one query in this way: Rows will be appended after each other.