title: How do I match two different big data frame in R?
body: <p>I want to learn that how can I match two different data frame in R? Like these dataframes;</p>
  <pre class="lang-r prettyprint-override"><code>df1 = data.frame(Country = c(&quot;United state&quot;,&quot;Korea,Republic of&quot;,&quot;Macau&quot;,&quot;China, People's Republic of&quot;,&quot;united kingdom&quot;))
  
  df2 = data.frame(Country = c(&quot;United state of America&quot;,&quot;Korea&quot;,&quot;Macau SAR&quot;,&quot;China&quot;,&quot;England&quot;))
  </code></pre>
  <p>I want to match these dataframes. And absolutely I can do it with using case_when command but I imagine if this was a big data and I wouldn't be able to see these differences.Then what will I have to do. Is there an easy way to do this? I would appreciate it if you could help.</p>