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100% Pass 2025 High Pass-Rate Salesforce DEX-450: Programmatic Development using Apex and Visualforce in Lightning Experience Valid Test Sims

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Salesforce Programmatic Development using Apex and Visualforce in Lightning Experience Sample Questions (Q122-Q127):

NEW QUESTION # 122
A Visualforce page is required for displaying and editing Case records that includes both standard and custom functionality defined in an Apex class called myControllerExtension.
The Visualforce page should include which <apex:page> attribute(s) to correctly implement controller functionality?

A. controller="Case" and extensions="myControllerExtension"
B. extensions="myControllerExtension"
C. controller="myControllerExtension"
D. standardController="Case" and extensions="myControllerExtension"

Answer: D

NEW QUESTION # 123
A company has a custom object, order__C, that has a required, unique external ID field called crder_number_c.
Which statement should be used to perform the DML necessary to insert new records and update existing records in a list of order_c records using the external ID field?

A. merge orders;
B. upserrc orders Order Number_c;
C. upsert orders:
D. merge orders Order_Number_c;

Answer: B

Explanation:
To perform DML operations that insert new records and update existing records in a list of Order__c records using the external ID field Order_Number__c, you should use:
Option D: upsert orders Order_Number__c;
Upsert Statement:
The upsert DML operation either inserts or updates records based on whether they already exist.
By specifying the external ID field (Order_Number__c), Salesforce will match existing records based on this field.
Syntax:
upsert orders Order_Number__c;
orders is the list of Order__c records.
Order_Number__c is the external ID field used for matching.
Reference:
"The upsert statement matches the sObjects with existing records by comparing values of one field. If you don't specify a field, the upsert statement uses the sObject's ID to match data."
- Apex Developer Guide: Upsert Statements
Why Other Options Are Incorrect:
Option A: merge orders;
The merge statement is used to merge up to three records of the same object type, combining them into one. It is not suitable for upserting multiple records.
Option B: merge orders Order_Number__c;
merge does not accept an external ID field as a parameter.
Option C: upsert orders;
While this will perform an upsert based on the record IDs, it will not use the external ID field Order_Number__c for matching, which may not find existing records without IDs.
Conclusion:
Using upsert orders Order_Number__c; correctly instructs Salesforce to insert or update records based on the external ID field.

NEW QUESTION # 124
The value of the account type field is not being displayed correctly on the page. Assuming the custom controller is properly referenced on the Visualforce page, what should the developer do to correct the problem?

A. Change theAccount attribute to public.
B. Convert theAccount.Type to a String.
C. Add a getter method for the actType attribute.
D. Add with sharing to the custom controller.

Answer: C

NEW QUESTION # 125
A developer created a Visualforce page and custom controller to display the account type field as shown below.
Custom controller code:

Visualforce page snippet:

what should the developer do to correct the problem?

A. Change theAccount attribute to public.
B. Convert theAccount.Type to a String.
C. Add a getter method for the attribute.
D. Add with sharing to the custom controller.

Answer: C

NEW QUESTION # 126
A developer is debugging the following code to determinate why Accounts are not being created Account a = new Account(Name = 'A'); Database.insert(a, false); How should the code be altered to help debug the issue?

A. Add a try/catch around the insert method
B. Add a System.debug() statement before the insert method
C. Set the second insert method parameter to TRUE
D. Collect the insert method return value a Saveresult variable

Answer: D

NEW QUESTION # 127
......

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