title: Informix to SQL attribute constraint
body: <p>I have a constraint as follows in my script &amp; I learnt that it's Informix:</p>
  
  <pre><code>create table blaBla
  {
   var_name_1 not null constraint n255_153,
   var_name_1 not null constraint n655_699,
  }
  </code></pre>
  
  <p>I can't find an equivalent to this in SQL. I tried just typing it the same but it doesn't work.  What's the equivalent in other DBMS?</p>