This paper introduces a new method for efficiently combining data tables called a "non-recursive reverse polish notation tree." They focus on improving the way computers join together different sets of data, which is crucial for making database systems work faster. The method handles complex join operations by organizing data in a specific tree structure for quicker processing. The researchers compare two types of join sequences, one linear and one more complex, to see how well their method works. Their experiments show that this new approach can speed up the process of sorting and merging data tables in computer memory.