public class CaseHelper {
    public static List<String> getOpenCasesWithAccountPhone() {
        List<String> result = new List<String>();
 
        // Query open Case records, sorted by LastModifiedDate in descending order, limited to 100 records
        List<Case> openCases = [
            SELECT Subject, Account.Phone 
            FROM Case 
            WHERE Status = 'Open' 
            ORDER BY LastModifiedDate DESC 
            LIMIT 100
        ];
 
        // Process each case and format the output
        for (Case c : openCases) {
            String accountPhone;
 
            if (c.Account == null) {
                accountPhone = 'No Account';
            } else if (c.Account.Phone == null) {
                accountPhone = 'No Phone';
            } else {
                accountPhone = c.Account.Phone;
            }
 
            result.add('Case Subject: ' + c.Subject + ', Account Phone: ' + accountPhone);
        }
 
        return result;
    }
}
 

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