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 column for all rows that satisfy the WHERE clause, and the result is returned with the column label Total_Price because of the alias.

1) Relevant knowledge points and concepts
- The WHERE clause filters rows before any aggregate is computed. Here Product_Type = 'WOOD' restricts to only wood products.
- The SUM() aggregate adds up numeric values across the filtered rows.
- Without a GROUP BY, an aggregate produces a single-row result (one scalar value).
- The AS Total_Price alias names the resulting column in the output.

2) Step-by-step reasoning
- Start with the Product_V view, which may contain many product rows with columns including Product_Type and Standard_Price.
- Apply the filter Product_Type = 'WOOD' to select only rows representing wood products.
- Compute SUM(Standard_Price) over those selected rows: add each Standard_Price value together.
- Return a single-row result with one column labeled Total_Price containing that sum.

3) Example with intermediate steps
Assume Product_V has rows with Standard_Price for wood products: 10.00, 20.00, 30.00.
- After WHERE filter: rows = {10.00, 20.00, 30.00}
- SUM = 10.00 + 20.00 + 30.00 = 60.00
- Output: one row, Total_Price = 60.00
(If no wood rows exist, many SQL implementations return NULL for SUM; some can be handled with COALESCE to convert to 0.)

4) Why the correct answer is correct
Because the query explicitly restricts to Product_Type = 'WOOD' and uses SUM on Standard_Price, it produces the total (aggregate) price of all wood products in the view, presented under the column name Total_Price.

5) Why the other options are incorrect
- "The total price of all products in the view": incorrect because the WHERE clause limits to WOOD only, not all products.
- "The Standard_Price of the first wood product in the view": incorrect because SUM aggregates all matching rows, it does not return a single row's value or the "first" value.
- "The Standard_Price of any wood product in the view": incorrect for the same reason—SUM yields the combined total, not an arbitrary single product's price.

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

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

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