... 选择顺序存取 selection sequential access 选择索引 selective index 选择替换技术 selection replacement technique ...
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进入控制面板,选择索引选项。
我们只选择索引,因为这正是我们的兴趣所在。
We select only Indexes as that is what we are interested in.
另一个原则是迫使优化器选择索引“或”操作来访问employee表。
A guideline to force the optimizer to choose the index oring operation to access the EMPLOYEE table.
So I'm not going to take the item with an index of 2.
所以我不会选择,索引值为2的物品。
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