Difficulty: Hard

Average Score: 42%

An analyst would like to communicate the function of each Structured Query Language (SQL) query written. Which practice should the analyst follow?

Rationale

Add comments to queries.

Adding comments to SQL queries is a best practice that enhances code readability and provides context for the function of each part of the query. This allows other analysts or developers to easily understand the purpose and logic behind the code, facilitating collaboration and maintenance.

A (Use indentation while writing queries) YOUR ANSWER

While using indentation can improve the readability of SQL queries by visually separating different parts, it does not provide context or explanations about the query's function. Indentation alone may help in understanding the structure, but it lacks the explicit communication of intent that comments convey.

B (Add comments to queries) CORRECT

Comments serve as a direct way to explain what each part of the SQL query does, making it easier for others (or the original author at a later date) to understand the logic without having to decipher the code line by line. This practice is crucial for maintaining clarity in complex queries and ensuring that their purpose is clear.

C (Write short queries) YOUR ANSWER

While brevity in SQL queries can be beneficial, it does not guarantee that the function of the queries is communicated effectively. Short queries might lack necessary detail, leading to ambiguity about their purpose. Therefore, simply writing shorter queries does not inherently improve understanding.

D (Write queries in capital letters) YOUR ANSWER

Using capital letters for SQL keywords can help in distinguishing them from other text; however, it does not provide any explanation of the query's function. This practice may improve readability to some extent but does not add the informative context that comments provide.

Conclusion

Effective communication of SQL query functions is best achieved through the addition of comments. While practices like indentation and capitalization can enhance readability, they do not replace the need for explanatory comments that clarify the purpose of each query component. By incorporating comments, analysts ensure that their queries are more understandable and maintainable for themselves and others in the future.

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