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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
Topic 1: Apex Transaction Management	10%	- Governor Limits 1. DML statement limits 2. SOQL query limits 3. CPU time and heap size limits - Transaction Control 1. System.debug() usage 2. Database methods with allOrNone parameter 3. Savepoint and rollback
Topic 2: 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. Query options (LIMIT, ORDER BY, WHERE) 3. Aggregate functions (COUNT, SUM, AVG, MIN, MAX) 4. Relationship queries (parent-child, child-parent)
Topic 3: Apex Fundamentals	10%	- Apex Basics 1. DML operations (insert, update, delete, etc.) 2. Using SOQL to query Salesforce data 3. Apex variables and data types 4. Apex operators and control flow statements - Apex Primitives 1. Date, Datetime, Time classes 2. ID and sObject types 3. Integer, Double, Long, String, Boolean types
Topic 4: Apex Testing	13%	- Test Classes 1. @isTest annotation 2. Test.startTest() and Test.stopTest() 3. Test data creation methods - Testing Best Practices 1. Using seeAllData=false for isolated tests 2. Assert statement usage 3. Coverage requirements (75% for deployment)
Topic 5: Apex Triggers	12%	- Trigger Best Practices 1. One trigger per object pattern 2. Handler class patterns 3. Recursive trigger prevention - Trigger Syntax and Context Variables 1. Trigger events (before insert, after insert, etc.) 2. Trigger.newMap and Trigger.oldMap 3. Trigger.old and Trigger.new context variables
Topic 6: Asynchronous Apex	10%	- Batch Apex 1. Database.Stateful 2. start(), execute(), and finish() methods 3. Database.Batchable interface - Future Methods 1. AsyncRequestLimit exceeded handling 2. @future annotation
Topic 7: 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
Topic 8: Visualforce Pages	8%	- VF Standard Components 1. , 2. Action methods and pageReference 3. , , - VF Page Basics 1. Controllers and controller extensions 2. component structure 3. Visualforce expressions