title: SQL only delete values in specific colums?
body: <p>What I am trying to do is delete all rows from a table, but leave values in 1 specific column from the table.</p>
  <p>For example the table 'member' with the columns 'membernumber', 'name', lastname' and 'zipcode', I only want to keep all the zipcodes as they are, but delete all other data.</p>