title: Find those rows with only one value in another column?
body: <p>This is my table</p>
  
  <pre><code>column1          column2 (varchar)
  --------------------------
  foobar           0
  foobar           1
  whatever         0
  whatever         0
  whatever         0
  </code></pre>
  
  <p>What I want is to get all those values from column1 that have only zeros in column 2. In this case I only want "whatever", because "foobar" has values 0 and 1. I tried with a join, but failed. How could I solve that?</p>
  
  <p>Thanks!</p>