Which of the following SQL queries will change the price of Mushrooms to 8.99?

Question

BlackTom AI · Accepted Answer

Question restatement: Which of the following SQL queries will change the price of Mushrooms to 8.99?

Answer options:
1) UPDATE Mushrooms
SET Price = 8.99
WHERE TABLE = Item;
2) UPDATE Item
SET Price = 8.99
WHERE ItemName = 'Mushrooms';
3) UPDATE INTO Item (ItemName)
VALUES (Price = 8.99);
4) UPDATE INTO Item
SET Mushrooms.Price = 8.99;

Option 1 analysis: This option attempts to update a table named Mushrooms, which may be a table or may be used as a value in ItemName. The clause WHERE TABLE = Item is invalid syntax because TABLE is a reserved word in many SQL dialects and cannot be compared like that, and the target table is unclear. Additionally, the correct pattern for updating a price field would reference a column, not a constant named TABLE.

Option 2 analysis: This option uses the standard SQL UPDATE syntax: UPDATE followed by the target table name (Item), then SET to assign Price = 8.99, and a WHERE clause that filters by ItemName = 'Mushrooms'. This matches the common pattern to update a specific row identified by a textual item name and assigns the new price value to the Price column. The structure is consistent with typical relational database SQL syntax across many systems (e.g., MySQL, PostgreSQL, SQL Server, Oracle with minor dialect differences).

Option 3 analysis: This option combines UPDATE with INTO and uses a VALUES clause, which is not a valid form for an UPDATE statement. The syntax resembles an INSERT statement more than an UPDATE, and integrating a price assignment inside VALUES is not how UPDATE operates. Overall, this will not execute as a valid UPDATE command.

Option 4 analysis: This option attempts UPDATE INTO Item, which is not standard SQL syntax. Then it uses Mushrooms.Price = 8.99 in a SET clause, which is invalid because you cannot qualify a column with a specific row value in the SET clause as shown. The statement misconstrues how to reference a specific row or column; standard practice is to use a column name in SET and a WHERE clause to select the target row(s).

Putting the pieces together, the second option follows the correct UPDATE syntax, targets the appropriate table, assigns the desired value to the Price column, and uses a WHERE clause to ensure only the Mushrooms row is updated. The other options misuse syntax, reserved words, or incorrect structures that do not conform to standard SQL UPDATE semantics.

Which of the following SQL queries will change the price of Mushrooms to 8.99?单项选择题

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