根据内核的政策，厂商不愿遵守参考核心的要求需要提供自己的(明确的名字命名)。
According to the kernel policy, vendors not wishing to comply with the requirements of the reference kernel need to supply their own (clearly named).
厂商实现他们自己的扩展并最终使其加入到SQL标准，但SQL的核心没有改变。
Vendors have implemented their own extensions that eventually make it into the SQL standard, but the core of SQL doesn't change.
虽然厂商会添加他们自己的特性，但仍有一部分精简的核心知识你能学习并且应用到你去到的每个地方。
While vendors may add their own features, there's a compact core of knowledge that you can learn and apply everywhere you go.
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