title: Fetching multiple rows based on two comparisons in each row
body: <p>I have a table as follows</p>
  
  <pre><code>col1 col2        col3
  a    01/01/2001   1.1
  a    01/02/2001   1.2
  a    01/03/2001   1.3
  b    02/03/2004   2.1
  b    02/04/2004   2.2
  b    02/05/2004   2.3
  </code></pre>
  
  <p>I want to be able to fetch rows based on multiple comparisons on each row. That is, fetch rows where I have <code>(a,01/01/2001)</code> and <code>(b,02/05/2004)</code>. Something that would look like,</p>
  
  <pre><code>Select * from table where col1,col2 in (('a','01/01/2001'),('b','02/05/2004'))
  </code></pre>
  
  <p>How can I do this?</p>