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				@@ -598,7 +598,7 @@ 
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				 	</select> 
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				 	<select id="getStudentTrainOverViewList" 
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				 			resultType="com.yonge.cooleshow.biz.dal.wrapper.TeacherIndexWrapper$StudentPracticeSummaryDto"> 
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				-		select su.username_ studentName,GROUP_CONCAT(sb.name_) subjectName,SUM(smcr.play_time_) totalPracticeTime, 
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				+		select su.username_ studentName,sb.name_ subjectName,SUM(smcr.play_time_) totalPracticeTime, 
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				 		       COUNT(DISTINCT DATE_FORMAT(smcr.create_time_, '%Y-%m-%d')) practiceDays, 
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				 		       SUM(smcr.play_time_) / COUNT(DISTINCT DATE_FORMAT(smcr.create_time_, '%Y-%m-%d')) averagePracticeTime 
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				 		from sys_music_compare_record smcr 
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