显示执行计划的命令：
SET SHOWPLAN_TEXT ON
SET SHOWPLAN_ALL ON
SET SHOWPLAN_XML ON
显示实际计划的命令：
SET STATISTICS PROFILE ON
SET STATISTICS XML ON
显示执行计划的命令：
SET SHOWPLAN_TEXT ON
SET SHOWPLAN_ALL ON
SET SHOWPLAN_XML ON
显示实际计划的命令：
SET STATISTICS PROFILE ON
SET STATISTICS XML ON