Execution Plan

Understanding SQL Server Execution Plan

An execution plan explains the processing approach (including multiple intermediate steps) used by the query optimizer to execute a query. Below are the best resources you could get to understand the SQL Server Execution Plan.

SQL Tuning Tutorial - Understanding a Database Execution Plan (1)
Codeproject

Execution Plan Basics
Simple Talk

SQL Server Execution Plans
SQL Server Central

SQL Server Query Execution Plan Analysis
SQL Server Performance

Sql Server Actual Execution Plan Vs Estimated Execution Plan
SQL Authority

Understanding Microsoft SQL Server Execution Plans
Channel9