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Oracle 数据库是否有类似 SQL Server 2008 稀疏列的东西?
在 SQL Server 中,稀疏列有效地管理数据库中的空数据,因为它们使 NULL 数据不占用物理空间。
我猜 Oracle 中的等价物是 Trailing Null,其中表中的尾随空列消耗零字节的存储空间。
I am trying to use a vector to hold my classes. These classes inherit methods from another class and have their own methods as well. What I am having trouble with is using the vector with objects to call