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				@@ -926,8 +926,8 @@ 
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				             ifnull(sees.actual_exercises_num_,0) as actual_exercises_num_, 
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				             ifnull(sees.exercises_reply_num_,0) as exercises_reply_num_, 
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				             ifnull(sees.exercises_message_num_,0) as exercises_message_num_, 
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				-            ifnull(a.sign_rate_,0) as sign_rate_, 
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				-            ifnull(a.pass_rate_,0) as pass_rate_ 
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				+            round(ifnull(a.sign_rate_,0) * 100,2) as sign_rate_, 
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				+            round(ifnull(a.pass_rate_,0) * 100,2) as pass_rate_ 
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				         from ( 
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				             select 
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				                 a.user_id_ as student_id_, 
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