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
它们之间的区别:http://sqlblog.com/blogs/kalen_delaney/archive/2007/07/30/did-you-know-estimated-vs-actual-plans.aspx
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