What is polymorphic query in salesforce?

Recap of Previous Sessions

So, we are learning Salesforce Object Query language and so far we have covered Relationship Queries in Salesforce.

Introduction

In Salesforce, a polymorphic relationship refers to a type of relationship between objects where the referenced object can be one of several different types.

For instance, in a Task object, the “Who (Name)” relationship field can be associated with either a Contact or a Lead, allowing for greater flexibility in data modeling.

Who refers To – Person – Lead/Contact

In a Task object, the “What (Related To)” relationship can be related to any custom or standard object except Lead or Contact

Structure

Example #1

Example #2

Example in Apex

Hands-On

Hands-On in Apex

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Assignment

Create an Apex Class and name is SOQLDemo
- Create a method and name it searchAccount that accepts a single parameter as the account name or portion of the account. Make a SOQL Query to get all the accounts whose names are the matching name as parameters and put a debug log.
- Create a method polymorphicQueryDemo and make a SOQL query to get the Event Information that is related to Account, Contact, Opportunity, and Case. See more for the query
  - When What is Account SELECT Id, Name, Phone, Industry
  - When What is Opportunity SELECT Id, Name, Amount
  - When What is Case SELECT Id, CaseNumber, Subject, Status
  - When What is Contact SELECT Id, Name, Email, Phone
- create a method soqlForLoopDemo and do the query on Account, Contact, and Opportunity using SOQL For Loop
- Create a method that accepts the List of Industries and the keyword. Inside the method make the SOQL Query that filters the account based on Industry and the name based on the parameter.
  - Note: – Name should be having “Like” the filter on the Account Name field
- Create a method and have the below query inside that method
  - Query All the Contact Record that does not have any Account Related To
  - Query All the Contact Records that are related to Account Record
  - Query All the Account Record that does not have any contact
  - Query All the Account Record that does have min one Contact Record
  - Query the Invoice Record, its Related Account, and Account Related Parent Account Record
  - Query the Invoice Line Item Record, its Related Invoice, Invoice Related Account, and Account Related Parent Account Record
  - Write a SOQL Query to Show the MAX amount from the opportunity
  - Write a SOQL Query to identify the duplicate records by Name & Email
  - Write a SOQL Query to display the count of Accounts for every Industry