多項選擇題

student表中記錄了同學(xué)每一次考試的成績。那么以下哪組sql代碼取數(shù)的結(jié)果中,id字段取值不會出現(xiàn)重復(fù)()

A.select id,max(score)from student group by id
B.select distinctidfromstudent
C.select id from student
D.select id from student where id is not null

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