Redeploy Interview Questions and Answers

Design a database for a university with colleges, departments, and students. Write a query to get students with maximum votes.

• Use a relational database like MySQL or PostgreSQL

• Create tables for colleges, departments, students, and elections

• Use foreign keys to establish relationships between tables

• Add columns for election details like candidate names and vote counts

• Write a query to join tables and filter for maximum vot

Design a bit.ly URL shortening service with database choice, table design, and endpoints.

• Use a relational database like MySQL or PostgreSQL for scalability and ACID compliance.

• Create a table with columns for the original URL, shortened URL, and metadata like creation date and click count.

• Endpoints should include URL shortening, redirection, and analytics.

• Implement caching to improve performance and reduce database load...read more

To show many columns in a single page for mobile-friendly design in Lightning, use responsive design and consider using horizontal scrolling.

• Use responsive design to ensure the layout adjusts to different screen sizes

• Consider using horizontal scrolling to allow users to view more columns without taking up too much vertical space

• Prioritize the most important columns to display first

• Use filters or collapsible sections to...read more

Use batch Apex to handle bulk callouts over button click

• Implement the Database.Batchable interface to process records in batches

• Use the @future annotation to make asynchronous callouts

• Consider using a queueable Apex job to handle large volumes of data

• Use the Limits.getCallouts() method to monitor callout limits

• Handle any errors or exceptions that may occur during the callout process

Yes, an email message can be sent from a trigger even after logic gets into AddError method.

• Email messages are sent asynchronously and are not affected by the AddError method.

• The AddError method only prevents the record from being saved and rolls back any changes made in the transaction.

• To send an email from a trigger, use the Messaging.SingleEmailMessage class and the Messaging.sendEmail method.

Order of execution in Salesforce determines the sequence of events that occur when a record is saved.

• Triggers are executed first

• Validation rules are checked next

• Before triggers are executed

• Custom validation logic is checked

• Record is saved to the database

• After triggers are executed

• Assignment rules are executed

• Auto-response rules are executed

• Workflow rules are executed

• Escalation rules are executed

• Roll-up summary fields a...read more

Optimizing SOQL and DML in Apex transactions

• Use selective SOQL queries to limit the number of records retrieved

• Avoid using SOQL queries inside loops

• Use bulkified DML operations to process records in batches

• Minimize the number of DML statements by grouping similar operations

• Use @future or Queueable Apex for long-running operations

• Consider using Database methods for DML operations to handle errors

• Use System.debug() to mo

It depends on the person's preferences and needs. Android phones offer more customization options and affordability, while iPhones have a more user-friendly interface and better security features.

• Ask the person why they want to switch from iPhone to Android

• Highlight the benefits of Android phones such as customization options and affordability

• Explain the differences in user interface and security features between the t...read more