What result set will the following query return?

SELECT Item_No
FROM Order_V
WHERE quantity 10;

Question

What result set will the following query return?

SELECT Item_No
FROM Order_V
WHERE quantity > 10;

BlackTom AI · Accepted Answer

SELECT Item_No FROM Order_V WHERE quantity > 10 returns the Item_No values from rows in the Order_V relation for which the quantity column is strictly greater than 10.

1) Relevant concepts
- SELECT specifies which column(s) to return (here Item_No).
- FROM names the table or view (Order_V).
- WHERE filters rows based on a boolean condition (quantity > 10).
- The > operator means strictly greater than (10 is excluded).
- Because no DISTINCT is used, the result will include one Item_No row for every matching row (duplicates possible).

2) Step-by-step reasoning
- The query scans Order_V row by row.
- For each row it evaluates the predicate quantity > 10.
- If the predicate is true, the query outputs the value of the Item_No column for that row.
- If false, the row is ignored.
- The final result set is the list of Item_No values for all rows meeting quantity > 10.

3) Example (intermediate steps)
Assume Order_V rows:
- Row1: Item_No = 1001, quantity = 5  → 5 > 10? No → exclude
- Row2: Item_No = 1002, quantity = 10 → 10 > 10? No → exclude
- Row3: Item_No = 1003, quantity = 11 → 11 > 10? Yes → include 1003
- Row4: Item_No = 1004, quantity = 15 → 15 > 10? Yes → include 1004
Result set: {1003, 1004}

4) Why the correct answer is correct
- The SELECT targets Item_No, so the result contains Item_No values.
- The WHERE condition is quantity > 10, so only orders with more than ten items are included. Hence “The Item_No of all orders that had more than 10 items” exactly describes the returned set.

5) Why the other options are incorrect
- “The Order_Id of all orders that had more than one item”: wrong column (Order_Id instead of Item_No) and wrong condition (>1 instead of >10).
- “The Order_Id of all orders that had more than 10 items”: wrong column (Order_Id) though condition matches.
- “The Item_No of all orders that had 10 or more items”: wrong comparator — “10 or more” implies quantity >= 10; the query uses > 10, excluding rows where quantity = 10.

Conclusion: The query returns the Item_No of all orders that had more than 10 items, which matches the provided correct answer.

What result set will the following query return? SELECT Item_No FROM Order_V WHERE quantity > 10; 单项选择题

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