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Hey guys, Im Venkat and in this video, well discuss how indexes actually work and help improve the performance of our sql queries. Well discuss how both the index types work - clustered and non-clustered. If youre new to indexes, weve already covered all the basics you need in this sql server tutorial for beginners course. Please check out the videos from parts 35 to 38. Ill include the link in the description of this video. Now, consider this Employees table. EmployeeId is the primary key, so by default a clustered index on the EmployeeId column is created. This means, employee data is sorted by EmployeeId column and physically stored in a series of data pages in a tree-like structure that looks like the following. The nodes at the bottom of the tree are called data pages or leaf nodes and contains the actual data rows in our case employee rows. These employee rows are sorted by EmployeeId column because EmployeeId is the primary key and by default