The scientists introduced new ways to speed up how databases combine information. Normally, databases use equi join to match data, but when dealing with complex XML data on the web, a different approach, called structural join, is needed. Existing methods for equi join couldn't handle structural join efficiently. So, they developed two new strategies to tackle these challenges: the equal high histogram join and the equal breadth histogram join. Through experiments, it was proven that both methods made combining XML data faster and more effective.