Salesforce Programmatic Development using Apex and Visualforce in Lightning Experience - DEX-450

Exam Code: DEX-450
Exam Name: Programmatic Development using Apex and Visualforce in Lightning Experience
Updated: Sep 17, 2026
Q & A: 202 Questions and Answers

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Reference: https://trailhead.salesforce.com/en/academy/classes/dex450-build-applications-programmatically-on-the-salesforce-platform/

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Salesforce DEX-450 Exam Syllabus Topics:

Section	Weight	Objectives
Working with Data - SOQL and SOSL	15%	- SOSL (Salesforce Object Search Language) 1. SOSL syntax and use cases 2. Returning sObjects from SOSL - SOQL (Salesforce Object Query Language) 1. Basic SOQL queries 2. Relationship queries (parent-child, child-parent) 3. Query options (LIMIT, ORDER BY, WHERE) 4. Aggregate functions (COUNT, SUM, AVG, MIN, MAX)
Apex Fundamentals	10%	- Apex Basics 1. DML operations (insert, update, delete, etc.) 2. Apex operators and control flow statements 3. Apex variables and data types 4. Using SOQL to query Salesforce data - Apex Primitives 1. Integer, Double, Long, String, Boolean types 2. ID and sObject types 3. Date, Datetime, Time classes
Apex Testing	13%	- Testing Best Practices 1. Assert statement usage 2. Coverage requirements (75% for deployment) 3. Using seeAllData=false for isolated tests - Test Classes 1. Test data creation methods 2. Test.startTest() and Test.stopTest() 3. @isTest annotation
Apex Triggers	12%	- Trigger Best Practices 1. One trigger per object pattern 2. Recursive trigger prevention 3. Handler class patterns - Trigger Syntax and Context Variables 1. Trigger.newMap and Trigger.oldMap 2. Trigger.old and Trigger.new context variables 3. Trigger events (before insert, after insert, etc.)
Apex Classes and Interfaces	12%	- Apex Classes 1. Class structure (attributes, methods, constructors) 2. Inheritance and virtual/abstract classes 3. Access modifiers (public, private, protected, global) - Apex Interfaces 1. When to use interfaces 2. Interface definition and implementation
Visualforce Pages	8%	- VF Page Basics 1. component structure 2. Visualforce expressions 3. Controllers and controller extensions - VF Standard Components 1. Action methods and pageReference 2. , 3. , ,
Asynchronous Apex	10%	- Future Methods 1. AsyncRequestLimit exceeded handling 2. @future annotation - Batch Apex 1. start(), execute(), and finish() methods 2. Database.Stateful 3. Database.Batchable interface
Apex Transaction Management	10%	- Transaction Control 1. System.debug() usage 2. Savepoint and rollback 3. Database methods with allOrNone parameter - Governor Limits 1. SOQL query limits 2. DML statement limits 3. CPU time and heap size limits