[Solved] Given the table orders with columns customer_id and order_amount, what does this query return?SELECT customer_id, SUM(order_amount) FROM orders GROUP BY customer_id; | SQL

SQL - GROUP BY and HAVING

Given the table orders with columns customer_id and order_amount, what does this query return?

SELECT customer_id, SUM(order_amount) FROM orders GROUP BY customer_id;

AList of customers with individual order amounts

BTotal order amount for each customer

CSum of all order amounts without grouping

DNumber of orders per customer

Step-by-Step Solution

Solution:

Step 1: Understand the query
The query groups rows by customer_id and calculates the sum of order_amount for each group.
Step 2: Interpret the result
Each row in the result shows a customer and the total of their orders.
Final Answer:
Total order amount for each customer -> Option B
Quick Check:
SUM aggregates values per group [OK]

Quick Trick: SUM with GROUP BY aggregates per group [OK]

Common Mistakes:

MISTAKES

Thinking SUM returns individual order amounts
Ignoring GROUP BY effect
Confusing SUM with COUNT

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More SQL Quizzes

Given the table orders with columns customer_id and order_amount, what does this query return?

Step 1: Understand the query

Step 2: Interpret the result

Final Answer:

Quick Check:

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