title: pypyodbc execute delete query error "Function sequence error"
body: <p>I was able to execute the delete SQL query in Python with pypyodbc as below</p>
  
  <pre><code>cur.execute("delete from table_a where a ='a';").commit()
  </code></pre>
  
  <p>However, I failed to run the delete SQL with a subquery</p>
  
  <pre><code>cur.execute("delete from table_a where a in ( select a from table_b );").commit() 
  </code></pre>
  
  <p>will return </p>
  
  <pre><code>pypyodbc.Error: ('HY010', '[HY010] [unixODBC][Driver Manager]Function sequence error')
  </code></pre>
  
  <p>How could I run a delete SQL with subquery?</p>