Given the query SELECT * FROM orders WHERE customer_id = ? and the parameter value 42, what will the query return if customer_id 42 exists?

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SQL - Security Basics

Given the query SELECT * FROM orders WHERE customer_id = ? and the parameter value 42, what will the query return if customer_id 42 exists?

AAn error because parameter is not named

BAll orders for all customers

CNo results because parameter binding is missing

DAll orders for customer with ID 42

Step-by-Step Solution

Solution:

Step 1: Understand parameter binding effect
The placeholder '?' is replaced safely with the value 42 during execution.
Step 2: Predict query result
The query returns all rows where customer_id equals 42, so matching orders are returned.
Final Answer:
All orders for customer with ID 42 -> Option D
Quick Check:
Parameter binding returns matching rows = All orders for customer with ID 42 [OK]

Quick Trick: Parameter '?' safely inserts value to filter results [OK]

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