What is the default order of sorting in SQL?

Question

BlackTom AI · Accepted Answer

The task asks about the default order of sorting in SQL and provides four possible options to evaluate.
Option 1: 'Random' — SQL does not sort by randomly by default. If a query returns rows in a seemingly random order, that is due to factors like query plan, indexes, or execution environment, not a default sorting rule. So this option misstates SQL’s default behavior.
Option 2: 'Descending' — There is no general default of descending order for all queries. Ordering is explicitly specified in an ORDER BY clause when a particular direction is needed. Without such specification, the database engine does not assume descending as the default.
Option 3: 'No sorting' — In the absence of an ORDER BY clause, SQL does not guarantee any particular order of the result set. This means the rows could come back in any order determined by the engine, indexes, or scan direction, rather than a defined sort.
Option 4: 'Ascending' — When an ORDER BY clause is used without explicitly choosing a direction, SQL requires you to specify ascending or descending; however, many contexts treat the natural or typical default as ascending when a direction is provided in some syntaxes, and some databases default to ascending if you omit the direction. Despite that, in standard SQL, you must specify ASC or DESC if you want an ordered result. Therefore, this option aligns with common expectations about sorting direction, though it depends on how the clause is written in practice.
In summary, each option highlights a common misconception or nuance: Random isn’t a defined default, Descending is not universally the default, No sorting describes the behavior when ORDER BY is absent, and Ascending reflects a widespread, but not universal, expectation of default ordering when a direction is implied. The overall concept centers on how and when SQL applies an ordered result versus leaving it unordered.

What is the default order of sorting in SQL?单项选择题

类似问题

To get all the customers from Hawaii sorted together, which of the following would be used?

Is the following statement true or false? In the products of methylation-hydrolysis, every -OH group corresponds to the position of a glycosidic bond in the starting polysaccharide.

Which of the follwoing structures represents amylopectin?

Which of the following is true about an aldopentose?I. It is a monosaccharide.II. It contains a CHO groupIII. It is a disaccharide.IV. It is an oligosaccharide.

For stock A, we have 𝛽 𝑖 = 0.70. Suppose the expected market risk premium next year is 9% and the risk-free rate is 3%. What is the expected return of this stock based on the CAPM? (Please answer in % and round to 2 decimal places. If the answer is 8.057%, then in the box, write 8.06)

更多留学生实用工具

智能学习助手

风格化写作助手

论文查重助手

文献引用助手

课堂转译助手

课堂笔记助手

Quiz搜索助手

学校历年真题

智能刷题助手

智能匹配练习

希望你的学习变得更简单