Cacher is the code snippet organizer for pro developers

Account acct = new Account(Name='SFDC Account');
insert acct;

// Once the account is inserted, the sObject will be 
// populated with an ID.
// Get this ID.
ID acctID = acct.ID;

// Add a contact to this account.
Contact mario = new Contact(
    FirstName='Mario',
    LastName='Ruiz',
    Phone='415.555.1212',
    AccountId=acctID);
insert mario;

// Children are deleted with parent
Account[] queriedAccounts = [SELECT Id FROM Account WHERE Name='SFDC Account'];
delete queriedAccounts;

// Query for the contact, which has been associated with an account.
Contact queriedContact = [SELECT Account.Name 
                          FROM Contact 
                          WHERE FirstName = 'Mario' AND LastName='Ruiz'
                          LIMIT 1];

// Update the contact's phone number
queriedContact.Phone = '(415)555-1213';

// Update the related account industry
queriedContact.Account.Industry = 'Technology';

// Make two separate calls 
// 1. This call is to update the contact's phone.
update queriedContact;
// 2. This call is to update the related account's Industry field.
update queriedContact.Account;