title: concat two numbers in sas proc sql
body: <p>I have a table that has two numeric values called <code>year</code> and <code>month</code>. I would like to create a new table that has one value called <code>ym</code> which is just the concatenation of <code>year</code> and <code>month</code>. Here is an example:</p>
  
  <pre><code>proc sql;
  create table test as 
  select CONCAT(year, month) as ym from tbl;
  run;
  </code></pre>
  
  <p>What is the <code>CONCAT</code> function that goes there?</p>