title: SQL Server double quotes issue
body: <p>Let's take an example.</p>
  
  <p>The <code>DATEDIFF</code> function has this signature:</p>
  
  <pre><code>DATEDIFF ( datepart , startdate , enddate )
  </code></pre>
  
  <p><code>datepart</code> must by an SQL keyword. Lets say, for minute, we mai use one of those keywords: <code>minute</code>, <code>mi</code>, <code>m</code>.</p>
  
  <p>If I am going to execute this statement</p>
  
  <pre><code>select datediff(mi,'2012-April-09','2013-April-08')
  </code></pre>
  
  <p>it will have the exact same effect as this one:</p>
  
  <pre><code>select datediff("mi",'2012-April-09','2013-April-08')
  </code></pre>
  
  <p>What is happening when those double quotes are met?</p>
  
  <p>What is SQL Server going to do with what in inside double quotes?</p>