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AND NOT EXISTS(SELECT student_id_ FROM practice_group WHERE cssp.music_group_id_=id_ AND cssp.group_type_='PRACTICE' AND type_!='TRIAL')
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AND NOT EXISTS(SELECT student_id_ FROM practice_group WHERE cssp.music_group_id_=id_ AND cssp.group_type_='PRACTICE' AND type_!='TRIAL')
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AND CONCAT(cs.class_date_, ' ', cs.start_class_time_) > NOW()
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AND CONCAT(cs.class_date_, ' ', cs.start_class_time_) > NOW()
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