百度试题 结果1 题目Is 91 a prime number or a composite number? Explain your reasoning.相关知识点: 试题来源: 解析 Composite number. 91=7*13, so it's a composite number.反馈 收藏
If the points(5,−1,1),(−1,−3,4)and(1,−6,10)are three vertices of a rhombus taken in order then which one of the following ils the fourth vertex? (A)(7,−4,11)(B)(3,−72,112)(C)(7,−4,7)(D)(7,4,11) ...
Explain why am = (-a)m, if m is any even integer. Power Properties: Among the properties of power, we can highlight the one related to the power of a power. This consists of having a base raised to two powers, which can be converted into a single power by multiplying both exponent...
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For example, in the following explain plan, the last step is a very unselective range scan that is executed 76563 times, accesses 11432983 rows, throws away 99% of them, and retains 76563 rows. Why access 11432983 rows to realize that only 76563 rows are needed?
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 is to visually inspect both of the execution plans. Examining the different aspects of an execution plan, from ...
This is useful for comparing execution plans or for understanding why the optimizer chooses one execution plan over another. Note: These simplified examples are not valid for recursive SQL.12.5 Reading EXPLAIN PLAN Output This section uses EXPLAIN PLAN examples to illustrate execution plans. The ...
created_at DESC LIMIT 5; The above is for the newest galleries. At first sight, these queries should be blazing fast because they’re using LIMIT. And that is the case on most queries using LIMIT. Unfortunately for us and our application, these queries are also using ORDER BY. Because ...
4 is the engine; 5 is the drive shaft by which the engine powers the propeller; 6 is a chamber through which air flows; 7 is a tunnel into which air flows beneath the machine; 10 is the cockpit; 11 is the cargo bay; 12 are the bay doors; and 14 is the steering rudder at the...
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, ...