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Hey guys, I am Venkat and in this video, weamp;#39;ll discuss two very common operations in sql server execution plans - Key lookup and RID lookup. Understanding these concepts is very important when we are tuning SQL queries for performance. Now, to better understand what weamp;#39;ll discuss in this video, you need to have a good knowledge of how indexes work in sql server and heap tables. If youamp;#39;re new to these concepts, weamp;#39;ve discussed them in our previous two videos. Iamp;#39;ll include the links in the description of this video. Consider this Employees table. There is no clustered index on this table. This means the physical order in which data rows are stored in this table is not guaranteed. A table without a clustered index is called a heap. A heap table may have one or more non-clustered indexes. We discussed all these heap table concepts in our previous video. Now, here is the sql script that creates Employees table and the secon