What results will be produced by the following SQL query?

SELECT SUM(Standard_Price) as Total_Price
from Product_V
where Product_Type = 'WOOD';

Question

What results will be produced by the following SQL query?

SELECT SUM(Standard_Price) as Total_Price
from Product_V
where Product_Type = 'WOOD';

BlackTom AI · Accepted Answer

SUM(Standard_Price) computes the sum of the Standard_Price values for rows that satisfy the WHERE clause, and the result is returned as a single column named Total_Price.

1. Relevant knowledge points and concepts
- WHERE filters rows before aggregation, so only rows with Product_Type = 'WOOD' are considered.
- SUM() is an aggregate function that adds numeric values from the selected rows.
- Using SUM without GROUP BY returns a single aggregated result (one row).
- SUM ignores NULL values; if there are no matching rows, most SQL implementations return NULL for the aggregate.

2. Step-by-step reasoning
- Step A: Scan Product_V and apply the filter Product_Type = 'WOOD'. This yields a subset of rows R = {r1, r2, ..., rn} that are wood products.
- Step B: For each row ri in R, take the value Standard_Price(ri).
- Step C: Compute the aggregate SUM over those values.
- Step D: Return a single result row with the column alias Total_Price containing that sum.

3. Intermediate calculation steps (symbolic)
- Let the Standard_Price values for wood rows be p1, p2, ..., pn (ignoring any NULLs).
- SUM(Standard_Price) = p1 + p2 + ... + pn.
- The query returns one row: Total_Price = p1 + p2 + ... + pn.

4. Why the correct answer is correct
- The WHERE restricts to wood products, and SUM aggregates their Standard_Price values. The alias "as Total_Price" labels that single numeric result. Therefore the result is the total price of all wood-type products in the view.

5. Why the other options are incorrect
- "The Standard_Price of any wood product in the view": SUM returns the sum of all such prices, not a single arbitrary product’s price.
- "The total price of all products in the view": This ignores the WHERE filter; the query sums only wood products.
- "The Standard_Price of the first wood product in the view": Aggregation does not return a “first” row’s value; it returns the sum.

6. Conclusion
The query returns the total price of all products that are of type wood in the view, which matches the provided correct answer.

What results will be produced by the following SQL query? SELECT SUM(Standard_Price) as Total_Price from Product_V where Product_Type = 'WOOD'; 单项选择题

类似问题

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