select sname,avg(grade) from sc,student wherestudent.sno=sc.sno 这句话有没有错,求grade的平均值select sname,avg(grade) from sc,student wherestudent.sno=sc.sno这句话有没有错,求grade的平均值
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![select sname,avg(grade) from sc,student wherestudent.sno=sc.sno 这句话有没有错,求grade的平均值select sname,avg(grade) from sc,student wherestudent.sno=sc.sno这句话有没有错,求grade的平均值](/uploads/image/z/13294889-17-9.jpg?t=select+sname%2Cavg%28grade%29+from+sc%2Cstudent+wherestudent.sno%3Dsc.sno+%E8%BF%99%E5%8F%A5%E8%AF%9D%E6%9C%89%E6%B2%A1%E6%9C%89%E9%94%99%2C%E6%B1%82grade%E7%9A%84%E5%B9%B3%E5%9D%87%E5%80%BCselect+sname%2Cavg%28grade%29+from+sc%2Cstudent+wherestudent.sno%3Dsc.sno%E8%BF%99%E5%8F%A5%E8%AF%9D%E6%9C%89%E6%B2%A1%E6%9C%89%E9%94%99%2C%E6%B1%82grade%E7%9A%84%E5%B9%B3%E5%9D%87%E5%80%BC)
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