title: What does "SELECT INTO" do?
body: <p>I'm reading sql code which has a line that looks like this:</p>
  
  <pre><code>SELECT INTO _user tag FROM login.user WHERE id = util.uuid_to_int(_user_id)::oid;
  </code></pre>
  
  <p>What exactly does this do? The usual way to use SELECT INTO requires specifying the columns to select after the SELECT token, e.g.</p>
  
  <pre><code>SELECT * INTO _my_new_table WHERE ...;
  </code></pre>
  
  <p>The database is postgresql.</p>