Final answer:
To retrieve the ID, first name, and last name of each customer whose first name begins with the letter S in an SQL query, use the 'LIKE' operator with the 'WHERE' clause.
Step-by-step explanation:
To retrieve the ID, first name, and last name of each customer whose first name begins with the letter S in an SQL query, you can use the 'LIKE' operator along with the 'WHERE' clause.
Here's an example query:
SELECT ID, first_name, last_name FROM customer_table WHERE first_name LIKE 'S%';
This query will return the customer records where the first name starts with the letter S, along with their corresponding ID and last name.