Solution:Step 1: Understand the LEFT JOIN usageLEFT JOIN keeps all customers, even those without matching orders.Step 2: COUNT(Orders.OrderID) counts orders per customerGrouping by customer name counts how many orders each customer has, zero if none.Final Answer:List of customers with the number of

[Solved] Given these tables:Customers(CustomerID, Name)Orders(OrderID, CustomerID, Amount)What will this query return?SELECT Customers.Name, COUNT(Orders.... | SQL

SQL - Table Relationships

Given these tables:
Customers(CustomerID, Name)
Orders(OrderID, CustomerID, Amount)
What will this query return?

SELECT Customers.Name, COUNT(Orders.OrderID) AS OrderCount FROM Customers LEFT JOIN Orders ON Customers.CustomerID = Orders.CustomerID GROUP BY Customers.Name;

AList of customers who have placed at least one order

BList of customers with total amount spent on orders

CList of orders with customer names repeated for each order

DList of customers with the number of orders each placed, including customers with zero orders

Step-by-Step Solution

Solution:

Step 1: Understand the LEFT JOIN usage
LEFT JOIN keeps all customers, even those without matching orders.
Step 2: COUNT(Orders.OrderID) counts orders per customer
Grouping by customer name counts how many orders each customer has, zero if none.
Final Answer:
List of customers with the number of orders each placed, including customers with zero orders -> Option D
Quick Check:
LEFT JOIN + COUNT = all customers with order counts [OK]

Quick Trick: LEFT JOIN + COUNT counts all, including zero matches [OK]

Common Mistakes:

MISTAKES

Thinking COUNT counts total amount spent
Assuming only customers with orders appear
Confusing JOIN types and their effects

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More SQL Quizzes

Given these tables:

Step 1: Understand the LEFT JOIN usage

Step 2: COUNT(Orders.OrderID) counts orders per customer

Final Answer:

Quick Check:

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