SQL Server数据库设计和高级查询[SQL Advance]

				DECLARE @myavg float
				SELECT @myavg=AVG(writtenExam)  from stuMarks
				print '本班平均分'+convert(varchar(5),@myavg)
				IF (@myavg>70)
				  BEGIN
				    print '本班笔试成绩优秀，前三名的成绩为'
				    SELECT TOP 3 * FROM stuMarks ORDER BY writtenExam DESC
				  END
				ELSE
				  BEGIN
				    print '本班笔试成绩较差，后三名的成绩为'
				    SELECT TOP 3 * FROM stuMarks ORDER BY writtenExam DESC
				  END