Prediction Accuracy - Aster Analytics

This query displays the prediction accuracy:

SELECT (SELECT COUNT(*) FROM housing_prediction, housing_test
  WHERE housing_prediction.sn = housing_test.sn
  AND housing_prediction.pred_label =
    housing_test.homestyle) / (SELECT COUNT(SN) FROM housing_prediction)
  ) AS PA;

The prediction accuracy is 98.1%, a large improvement over the Forest_Predict function, whose prediction accuracy is 77.7% on the same input.