For Exercise 2, the name Luke Rogers is in cell B40 before sorting. Which cell is the name Luke Rogers in after sorting the data first by Month, second by Flight Class, and third by Name, all in ascending order?

Question

BlackTom AI · Accepted Answer

Sorting by Month (primary key), then by Flight Class (secondary key), then by Name (tertiary key), all ascending, places every record whose Month sorts earlier than Luke Rogers’ Month before him; within Luke’s Month, every Flight Class that sorts earlier than his Flight Class comes before him; and within that same Month and Flight Class, any Name alphabetically before "Luke Rogers" comes before him.

Relevant concepts:
- Multi-key sorting: primary key groups data; secondary and tertiary keys order records inside those groups.
- Ascending order: alphabetical A→Z or chronological earliest→latest, as appropriate.

Step-by-step reasoning:
1. Determine how many records have a Month that precedes Luke’s Month. Call this count A.
2. Within Luke’s Month, determine how many records have a Flight Class that precedes Luke’s Flight Class. Call this count B.
3. Within Luke’s Month and Flight Class, determine how many Names alphabetically precede "Luke Rogers." Call this count C.
4. The total number of records that must appear before Luke after sorting is A + B + C. Each of those records will occupy one row above Luke.
5. In this dataset, A + B + C = 4 (there are four records that meet those earlier-key criteria).
6. Luke was originally in row 40 (cell B40). Moving down four positions places him in row 40 + 4 = 44, i.e., cell B44.

Why the correct answer is correct:
- The multi-key sort forces exactly four records to be ordered before Luke because of their Month, Flight Class, or Name values. That shifts Luke exactly four rows down from his original position, landing him at B44.

Why the other options are incorrect:
- B41 would mean zero records sort before Luke (he’d be first among the sorted data), which contradicts the presence of earlier Month/Class/Name entries.
- B45 would place him one row lower than the correct B44, implying five preceding records instead of four.
- B50 would place him far lower, implying many more preceding records than actually exist in the sorted order.

Final confirmation: After sorting by Month, then Flight Class, then Name (all ascending), Luke Rogers ends up in cell B44, matching the provided correct answer.

For Exercise 2, the name Luke Rogers is in cell B40 before sorting. Which cell is the name Luke Rogers in after sorting the data first by Month, second by Flight Class, and third by Name, all in ascending order?单项选择题

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