• 2022-06-06
    The height of a B-tree decreases only whenB树高度的减少只会发生于
    A: merging two children of the root 根节点的两个孩子合并
    B: removing the root 根节点被删除
    C: rotating the root 根节点发生旋转
    D: there are multiple keys in the root 根节点有多个关键码