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I've made an actual use for them in a project I've been working on for the last several months (which is partly why there were no updates for so long!) Part of the project is a task management system where each task has several persons related to it. There can be the creator of ...
Still it is expected that the optimizer will generate sub-optimal plans for some SQL statements now and then. In cases where there is an alternative plan that performed better than the plan generated by the optimizer, the first step in diagnosing why the Optimizer picked the sub-optimal plan ...
动词变名词 1. acceptance 2. achievement 3. admission 4. appearance 5. approval 6. argument 7. arrangement 8. arrival 9. beginning 10. behavio(u)r 11. competition 12. concentration 13. conclusion 14. contribution 15
But if hovercraft are so wonderful, why aren't they used everywhere? They're expensive initially and, though cheaper than helicopters, considerably more costly to maintain than ships and boats of similar cargo capacity (because they're essentially aircraft, not boats, and mechanically more complex...
Also, the bits in the bitmap for c2 IS NULL are subtracted, explaining why there are two MINUS row sources in the plan. The NULL subtraction is necessary for semantic correctness unless the column has a NOT NULL constraint. The TO ROWIDS option generates the rowids necessary for the table ...
Haskell never became one of the most popular languages in the software industry or part of the mainstream, but it has been and still is quite influential in the software development community.In this article I try to explain why Haskell keeps being such an important language by presenting some...
Function and Relation: A relation is called a function if the set of points produced by the relation does not have the samex-coordinate. That is, a relation containing the points(a,b)and(a,c)is not a function as thex-valuex=ais repea...
We'll first analyze the original query, then attempt to optimize the query and look into the optimized query's execution plan to see what changed and why. This is the first article in a series of posts. Each post will walk you through a more advanced SQL query than the previous post, ...
They can accept information that is 9 or incomplete. It is more 10 for them to learn to think in the language than to know the 11 of every word. 12 successful language learners are learners with 13 . They want to learn language because they are interested in the language and the people...