PDI Exam Dumps - Salesforce Certified Platform Developer 1 (WI25)

A: An External ID field is designed to store an ID from another external system, which can be used to match Salesforce records with data from an external source during data imports or integrations.

D: External ID fields are automatically indexed, which can significantly improve the performance of SOQL queries when filtering based on the External ID.

Why not other options?

B: External IDs cannot be formula fields. Only text, number, email, and auto-number fields can be set as External IDs.

C: While External IDs are useful for integrations, they do not make external data visible within Salesforce Mobile.

References:

External IDs Overview

Why a Trigger on the Child Object?

Since the relationship is not master-detail, a trigger on the child object can perform aggregate calculations and update the parent Opportunity.

Why Not Other Options?

A: Tree sorting is unnecessary and unrelated to roll-up summaries.

B and D: Neither Streaming API nor Metadata API is suitable for real-time roll-up calculations.

Custom Roll-Up Summaries: https://developer.salesforce.com/docs/atlas.en-us.apexcode.meta/apexcode/apex_triggers_best_practices.htm

References:

An External ID field is used to match data in Salesforce with data from external systems (like an on-premise SQL database). It allows for easy upserts and data integration without relying on Salesforce IDs.

Why not other options?

A: External objects are used for real-time integration with external systems but do not address data matching directly.

C: Formula fields are calculated fields and cannot be used for data matching.

D: Lookup fields are used for creating relationships between objects within Salesforce, not for matching external data.

Trigger.old in a before insert trigger:

The Trigger.old context variable contains the old version of the records being processed in the trigger.

In a before insert trigger, the records being processed are new and have no prior state in the database, so Trigger.old is null.

This behavior is specific to insert triggers because there is no "old" record to reference before the record is created.

Why is it null?

The Trigger.old variable is only populated for triggers that handle updates or deletions (e.g., before update, after update, before delete, after delete). For insert operations, no previous state of the record exists.

Why not the other options?

A. An empty list of sObjects:

This is incorrect because Trigger.old is not initialized as an empty list for insert triggers—it is simply null.

B. Undefined:

Trigger.old is defined in the trigger context, but it is null for insert operations. Undefined is not a valid Apex state.

D. A list of newly created sObjects without IDs:

This describes Trigger.new in a before insert trigger, not Trigger.old. Trigger.new contains the new records being inserted.

References:

Apex Triggers Documentation

Trigger Context Variables

To make an LWC available for use on a record page:

Target Configuration:

Add lightning__RecordPage in the component's .js-meta.xml file to specify where the component can be used.

Expose the Component:

Set isExposed to true in the .js-meta.xml file to make the component available for use.

Example .js-meta.xml File:

57.0

true

lightning__RecordPage

A: Incorrect placement. The tag must be in the .js-meta.xml file, not the JavaScript file.

D: The tag is used for metadata labeling, not for exposing or targeting a component.

LWC Metadata Configuration: https://developer.salesforce.com/docs/component-library/documentation/en/lwc/lwc.create_metadata_config_file

Why Not the Other Options?References:

The requirement specifies that the Salary__c field should function as a currency input and honor field-level security.

The lightning-input-field component (Option C) automatically respects field-level permissions set in Salesforce and ensures the Salary__c field is editable and viewable only by authorized users.

Other options do not guarantee compliance with field-level security:

Option A: does not enforce field-level security.

Option B: is read-only and cannot be used for editing.

Option D: requires custom logic for enforcing security.

References:

Lightning Web Components Documentation

Field-Level Security Best Practices

Interfaces in Java and Salesforce Apex:

In Java or Apex, interfaces define a contract that classes must fulfill. They provide method signatures that any implementing class must define.

The keyword implements is used to implement an interface.

Classes and Inheritance:

A class in Java/Apex cannot use extends to inherit from an interface. The extends keyword is reserved for inheriting from another class, while implements is used for interfaces.

Multiple Interfaces:

A class can implement multiple interfaces in both Java and Salesforce Apex. This is done by separating interface names with commas after the implements keyword.

Correct Syntax:

To create a DrawList class that implements both Sortable and Drawable interfaces, the syntax must:

Use implements for interfaces.

Provide implementations for all methods defined in the interfaces.

Analysis of Options:

Option A:

Uses implements for each interface separately, which is syntactically incorrect in Java/Apex.

Invalid due to redundancy.

Option B:

Correctly uses implements for multiple interfaces separated by a comma.

Provides implementations for both methods, sort() and draw().

Option C and D:

Use extends for interfaces, which is invalid. Interfaces cannot be extended by classes.

Final Implementation:

public class DrawList implements Sortable, Drawable {

public void sort() {

// Implementation of sort method

}

public void draw() {

// Implementation of draw method

}

}

References:

Apex Classes and Interfaces Documentation

Trailhead Module on Apex Interfaces

Option B is the correct implementation as it adheres to the rules for working with interfaces in Java/Apex.

C: The Bulk API is designed for importing or exporting large volumes of data and works efficiently in development environments, but it respects storage limits.

D: Developer and Developer Pro sandboxes have different storage limits. Developer Pro has a larger storage limit compared to a Developer sandbox.

Why not other options?

A: Bulk API does not bypass storage limits.

B: The Data Import Wizard is a web-based tool, not an application installed on your computer.

References:

Salesforce Data Import and Export

Salesforce Bulk API