Ecto.Adapters.SQL.Connection.update

You're seeing just the callback update, go back to Ecto.Adapters.SQL.Connection module for more information.

update(prefix, table, fields, filters, returning)

update(
  prefix :: String.t(),
  table :: String.t(),
  fields :: [atom()],
  filters :: [atom()],
  returning :: [atom()]
) :: iodata()

Returns an UPDATE for the given fields in table filtered by filters returning the given returning.