• 2022-06-07
    查询借阅了两本和两本以上图书的读者姓名和单位,应使用SQL语句
    A: SELECT姓名,单位FROM读者;
    B: WHERE借书证号IN;
    C: (SELECT借书证号FROM借阅;
    D: GROUP BY借书证号HAVING COUNT(*)>=2)
    E: SELECT姓名,单位FROM读者;
    F: WHERE借书证号EXISTS;
    G: (SELECT借书证号FROM借阅;
    H: GROUP BY借书证号HAVING COUNT(*)>=2)
    I: SELECT姓名,单位FROM读者;
    J: WHERE借书证号EXISTS;
    K: (SELECT借书证号FROM借阅;
    L: GROUP BY借书证号WHERE COUNT(*)>=2)
    M: SELECT姓名,单位FROM读者;
    N: WHERE借书证号IN;
    O: (SELECT借书证号FROM借阅;
    P: GROUP BY借书证号WHERE COUNT(*)>=2)
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