Sadducees

In Luke. 18:13 I read about the Pharisee praying his prayer, thanking God that he is not like the other men. Then the tax collector prayed his prayer of humility. Somehow I always thought that the other man was a Sadducee; and I was surprised when I read it again and found it was the tax collector and not the Sadducee. Where did I get the idea that the Sadducee was ‘sad you see’, and that therefore that was how you distinguish one from the other? What is the difference between the Pharisee and the Sadducee? Is there any other place that uses the Pharisee and the Sadducee in a situation that would have made me think that the Sadducee was a humble man?