title: Selecting from a Database based on a list of unique pairs
body: <p>For Example if I am given the following table</p>
  
  <pre><code>Id        Key             Value
  
   1          A             Alpha
   2          B             Alpha
   3          A             Charlie
  </code></pre>
  
  <p>And I took the input {(A, Charlie) and (B, Alpha)} and I asked to return all the IDs I would want it to return 2 and 3 but NOT 1. </p>
  
  <p>What is the best way to do this? Can I combine it all into one query, (for speed) or would I have to run a repeat query for each value pair I received.</p>