Insert rows from another table

Hi.

This might be simple, but I don't know how to do this.

I have two facttables with similar data where I want data from one table to be inserted in the other. When I do a merge the columns is added, but I don't want more columns. The two tables consists of four columns; Article, Date, UnitInStock, FullCost. So I would like to merge all rows into one table in the Query Editor.