title: Similar function to SQL 'WHERE' clause in R
body: <p>I have a data set assigned to a variable named 'temps', which have columns 'date', 'temperature', 'country'.<br>
  I want to do something like this, which I can do in SQL</p>
  
  <pre><code>SELECT * FROM temps WHERE country != 'mycountry'
  </code></pre>
  
  <p>How can I do similar selection in R?</p>