title: pandasql OperationalError: too many SQL variables
body: <p>I'm trying to work with <code>pandasql</code> but something is not working properly. I execute the following code:</p>
  
  <pre><code>from pandasql import sqldf, load_meat
  pysqldf = lambda q: sqldf(q, globals())
  meat = load_meat()
  df = pysqldf("SELECT * FROM meat LIMIT 10;").head()
  </code></pre>
  
  <p>and get this error:</p>
  
  <pre><code>OperationalError: (sqlite3.OperationalError) too many SQL variables [SQL: 'INSERT INTO meat (date, beef, veal, pork, lamb_and_mutton, broilers, other_chicken, turkey) VALUES
  </code></pre>
  
  <p>and </p>
  
  <pre><code>(Background on this error at: http://sqlalche.me/e/e3q8)
  </code></pre>
  
  <p>What could be the problem?</p>