SQL-Server saves all executions plans in its Cache so that when ever a similar requirement arrives instead of following a new path it retrieves the cached query Execution plan from its cahe and executes it.
this makes SQL-Server to be much faster.
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SELECT TOP 50 qs.creation_time, qs.execution_count, qs.total_worker_time as total_cpu_time, qs.max_worker_time as max_cpu_time, qs.total_elapsed_time, qs.max_elapsed_time, qs.total_logical_reads, qs.max_logical_reads, qs.total_physical_reads, qs.max_physical_reads,t.[text], qp.query_plan, t.dbid, t.objectid, t.encrypted, qs.plan_handle, qs.plan_generation_num FROM sys.dm_exec_query_stats qs CROSS APPLY sys.dm_exec_sql_text(plan_handle) AS t CROSS APPLY sys.dm_exec_query_plan(plan_handle) AS qp ORDER BY qs.total_worker_time DESC