An analyst wants to extract data from an invoice file of unique invoice IDs with an invoice amount greater than $1,000. Which combination of Structured Query Language (SQL) statements will perform this task?

Rationale

DISTINCT and WHERE statements will perform the task of extracting unique invoice IDs with amounts greater than $1,000.

To extract data based on specific conditions in SQL, the WHERE clause is essential for filtering results, while the DISTINCT keyword ensures that the returned invoice IDs are unique. This combination effectively meets the requirement of selecting unique invoice IDs that exceed the specified amount.

A (TRIM and COALESCE statements) YOUR ANSWER

The TRIM function is used to remove whitespace from strings, and COALESCE returns the first non-null value in a list. Neither of these functions is relevant for filtering invoice amounts; they do not serve the purpose of extracting unique records or applying a condition based on numerical values.

B (LENGTH and TRIM statements) YOUR ANSWER

The LENGTH function calculates the number of characters in a string, and TRIM removes whitespace. Similar to the previous option, these functions do not apply to the task of filtering data based on invoice amounts or ensuring uniqueness among invoice IDs. They are unrelated to the requirements outlined in the question.

C (DISTINCT and WHERE statements) CORRECT

This combination is the correct answer because the WHERE statement filters the results to include only those invoices with amounts greater than $1,000. The DISTINCT keyword then ensures that the resulting list of invoice IDs comprises only unique entries, aligning perfectly with the analyst's objective.

D (ORDER BY and CONCAT statements) YOUR ANSWER

ORDER BY is used to sort the results of a query, while CONCAT combines strings. These functions do not facilitate the extraction of invoice IDs based on specific criteria or uniqueness, making them irrelevant for the analyst's needs in this scenario.

Conclusion

To effectively extract unique invoice IDs with amounts exceeding $1,000, the DISTINCT and WHERE statements in SQL are essential. The WHERE clause filters the dataset according to the specified amount, and the DISTINCT keyword ensures that only unique invoice IDs are returned. Other options like TRIM, COALESCE, LENGTH, ORDER BY, and CONCAT do not meet the requirements necessary for this data extraction task.

An analyst wants to extract data from an invoice file of unique invoice IDs with an invoice amount greater than $1,000. Which combination of Structured Query Language (SQL) statements will perform this task?

DISTINCT and WHERE statements will perform the task of extracting unique invoice IDs with amounts greater than $1,000.

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