title: Convert negative data into positive data in SQL Server
body: <p>The current data of the table is:</p>
  <pre><code>  a   b
  ---------
   -1   5
  -11   2
   -5  32
  </code></pre>
  <p>My request is to convert every data into a positive value.</p>
  <p>Unfortunately, I forgot the name of the built-in function of SQL Server that enables to convert.</p>