SQL系统。dm_exec_query_stats Last_Elapsed_Time胡说八道

I am working on a script I can deploy to any SQL server that will give some meaningful statistical information on the servers usage. I quite quickly realized though that I was getting some rather suspect results back from the last_elapsed_time column on sys.dm_exec_query_stats. Take the following script for example:I am working on a script I can deploy to any SQ