oracle or语句的坑

SELECT SUM(tjo.pay_amount) FROM tb_jf_order tjo,tb_jf_gateway_trade_log tjg

WHERE  tjo.order_id = tjg.biz_id AND

tjo.user_id = tjg.user_id    AND

(tjg.trade_type='p' OR tjg.trade_type='t') AND

tjo.user_id=''AND

tjo.order_state='' AND

tjo.order_type NOT IN ('','','') AND

tjo.order_date = to_char(SYSDATE,'yyyyMMdd');

1、上述sql中如果的两个or语句一定要赢括号括起来。