Add new article

Author: ktaranov

Articles/README.md

@@ -1466,6 +1466,7 @@ Articles types:
 | [Rowcount estimates when there are no Statistics] | Matthew Mcgiffen | 2021-01-26 | [DBA][DEV] |
 | [Processing Data Queues in SQL Server with READPAST and UPDLOCK] | Armando Prato | 2007-06-04 | [DBA][DEV] |
 | [Can You Get Parameter Sniffing on Updates and Deletes?] | Brent Ozar | 2021-01-27 | [DBA][DEV] |
+| [An Empirical Look at Key Lookups] | Forrest mc Daniel | 2020-12-30 | [DBA][DEV] |
 
 [Understanding how SQL Server executes a query]:http://rusanu.com/2013/08/01/understanding-how-sql-server-executes-a-query/
 [SQL Server Index Design Guide]:https://technet.microsoft.com/en-us/library/jj835095.aspx
@@ -2895,3 +2896,4 @@ Articles types:
 [Rowcount estimates when there are no Statistics]:https://matthewmcgiffen.com/2021/01/26/rowcount-estimates-when-there-are-no-statistics/
 [Processing Data Queues in SQL Server with READPAST and UPDLOCK]:https://www.mssqltips.com/sqlservertip/1257/processing-data-queues-in-sql-server-with-readpast-and-updlock/
 [Can You Get Parameter Sniffing on Updates and Deletes?]:https://www.brentozar.com/archive/2021/01/can-you-get-parameter-sniffing-on-updates-and-deletes/
+[An Empirical Look at Key Lookups]:https://forrestmcdaniel.com/2020/12/30/an-empirical-look-at-key-lookups/