[Solved] Given the table orders with columns customer_id and order_amount, what will 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 will this query return?

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

ANumber of orders per customer

BList of all orders sorted by customer_id

CTotal order amount for each customer

DAverage order amount for all customers

Step-by-Step Solution

Solution:

Step 1: Understand the query components
The query groups rows by customer_id and sums order_amount for each group.
Step 2: Interpret the result
SUM(order_amount) calculates total spending per customer, grouped by customer_id.
Final Answer:
Total order amount for each customer -> Option C
Quick Check:
GROUP BY customer_id with SUM = total per customer [OK]

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

Common Mistakes:

MISTAKES

Thinking it counts orders instead of sums
Assuming it sorts orders
Confusing average with sum

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More SQL Quizzes

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

Step 1: Understand the query components

Step 2: Interpret the result

Final Answer:

Quick Check:

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