title: Filtering the dataframe based on the column value of another dataframe
body: <p>I have 2 dataframes</p>
  
  <p>df1 </p>
  
  <pre><code>Company           SKU   Sales
  Walmart           A     100
  Total             A     200
  Walmart           B     200
  Total             B     300
  Walmart           C     400
  Walmart           D     500
  </code></pre>
  
  <p>df2</p>
  
  <pre><code> Company             SKU   Sales
   Walmart             A     400
   Total               B     300
   Walmart             C     900
   Walmart             F     400
   Total               G     500
  </code></pre>
  
  <p>I want a resulting dataframe (df2) which only has the records of matching SKUs in df1 and df2 </p>
  
  <p>df2</p>
  
  <pre><code>Company       SKU   Sales 
  Walmart       A     400
  Total         B     300
  Walmart       C     900
  </code></pre>
  
  <p>I want only the unique (Company + SKU) values  of df1 in df2</p>
  
  <p>Is there any good solution to achieve this?</p>