Given the following Apex statement: Account myAccount = [SELECT Id, Name FROM Account); What occurs when more than one Account is returned by the…

The Apex syntax sObject variable = [SOQLquery]; is specifically designed to assign a single record to an sObject variable. If the SOQL query returns more than one record, the Apex runtime environment throws a System.QueryException with the error message "List has more than 1 row for assignment". If this exception is not handled within a try-catch block, it is considered an unhandled exception, which immediately terminates the transaction and prevents further code execution.

1. Salesforce Apex Developer Guide

"SOQL and SOSL Queries": The guide explains that assigning a query result to a single sObject variable is only valid if the query returns exactly one record. It states

"If the query returns no records

a System.QueryException is thrown... Likewise

if the query returns more than one record

a System.QueryException is thrown."

Reference: Salesforce Apex Developer Guide

Chapter 3: "Database & DML"

Section: "Writing SOQL Queries".

2. Salesforce Apex Developer Guide

"Exception Class and Built-In Exceptions": This section documents the System.QueryException. It is described as an exception that is thrown for errors that occur during SOQL or SOSL query execution

including when a query that is expected to return a single row returns multiple rows.

Reference: Salesforce Apex Developer Guide

Appendix: "Apex Language Reference"

Section: "Exception Class and Built-In Exceptions".