title: Last Updated trigger for multiple tables
body: <p>We have a table tbl_siteinfo with two fields: siteid (pk) and lastupdated.</p>
  
  <p>We have several other tables such as tbl_users, tbl_customers, tbl_prices, tbl_hours which contain different types of data, but all of them have siteid as a primary key.</p>
  
  <p>We would like to create trigger(s) that will cause the lastupdated field in tbl_siteinfo (for the correct siteid row) to be automatically updated on any insert/update/delete action on any of the other tables</p>