|  | @@ -1960,7 +1960,7 @@
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				|  |  |          select DISTINCT sr.user_id_ from student_registration sr
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				|  |  |          left join music_group mg ON mg.id_ = sr.music_group_id_
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				|  |  |          <if test="classGroupId != null">
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				|  |  | -            left join class_group_student_mapper cgsm ON cgsm.music_group_id_ = sr.music_group_id_
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				|  |  | +            left join class_group_student_mapper cgsm ON cgsm.music_group_id_ = sr.music_group_id_ AND cgsm.user_id_ = sr.user_id_
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				|  |  |          </if>
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				|  |  |          where sr.music_group_id_ = #{musicGroupId} AND sr.music_group_status_ = 'NORMAL' AND mg.status_ = 'PROGRESS'
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				|  |  |          <if test="classGroupId != null">
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