How can you modify the subquery to return a single value?A) Add a GROUP BY clause to the subquery.B) Add a TOP 1 clause to the subquery.C) Add a DISTINCT clause to the subquery.
The correct answer is B) Add a TOP 1 clause to the subquery.
To modify a subquery to return a single value, you can use the TOP 1 clause in the subquery to limit the result set to a single row. This will ensure that the subquery returns only one value, which can then be used in the outer query.
For example, consider the following query:
SELECT name FROM customers WHERE customer_id = (SELECT customer_id FROM orders WHERE order_total > 1000)
If the subquery returns multiple customer_id values, the error “Subquery returned more than 1 value” will be thrown. To fix this, you can modify the subquery as follows:
SELECT name FROM customers WHERE customer_id = (SELECT TOP 1 customer_id FROM orders WHERE order_total > 1000)