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This course is designed for programme developers starting on the Salesforce platform who require programming customizations on Apex and Visualforce business logic as well as on user interface layers. There are no prerequisites for Salesforce DEX-450 Exam.

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