The last 3 years were the hottest ever recorded. Here’s why we may look back at them as some of the coolest we remember

· · 来源:dev资讯

next tuple of R. The selection node repeatedly calls next() on the table scan until it finds a tuple that satisfies a5. It then passes it up to the projection which finally returns it back to you.

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// They're not really 'magic', they just happen to work well.

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