This question runs in a pre-configured Salesforce environment - no personal connection required.
Query all Contact records that are not associated with an Account (AccountId is null). For each such Contact, build the full name by concatenating FirstName and LastName with a single space between them. If FirstName is null, use an empty string in its place and trim the resulting full name. Return the list of full names sorted alphabetically in ascending order. Return an empty list if no orphan contacts exist.
Examples:
Input: (no parameters - operates on org data)
Scenario: Two contacts with null AccountId exist
Contact 1: FirstName = John, LastName = Doe
Contact 2: FirstName = Alice, LastName = Smith
Output: ['Alice Smith', 'John Doe']
Explanation: Names are sorted alphabetically ascending
Scenario: No contacts have null AccountId
Output: []
Explanation: Return empty list when no orphan contacts exist
Scenario: Contact with null FirstName and null AccountId
Contact: FirstName = null, LastName = Johnson
Output: ['Johnson']
Explanation: Null FirstName is treated as empty string, then the full name is trimmed
Scenario: Multiple orphan contacts with same last name
Contact 1: FirstName = Anna, LastName = Brown
Contact 2: FirstName = Brian, LastName = Brown
Output: ['Anna Brown', 'Brian Brown']
Explanation: When last names match, first names determine alphabetical order
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