title: Meaning of := in SQL
body: <p>What does the <code>:=</code> operator mean in SQL? I am using Postgresql and I have no idea what it means. I have this code :</p>
  
  <pre><code>DECLARE
    i RECORD;
    q TEXT[];
    cfg_rec RECORD;
  BEGIN
    SELECT * FROM xxx_private.function() INTO cfg_rec;
    q:=q || cfg_rec.q;
  </code></pre>