mysql 预算准确率抒写

以下是MySQL计算准确率的SQL写法：

SELECT ROUND(T1.co / T2.totalCo * 100, 1) as accuracy 
FROM 
    (SELECT COUNT(*) AS co 
     FROM topic_exercise 
     WHERE user_id = 844228520938668032 AND user_answ=topic_answ) T1, 
    (SELECT COUNT(*) AS totalCo 
     FROM topic_exercise 
     WHERE user_id = 844228520938668032) T2;

该SQL语句通过查询`topic_exercise`表中用户ID为`844228520938668032`的记录，统计用户答题正确的数量`T1.co`和用户答题总数`T2.totalCo`，并计算准确率。最终结果保留一位小数，以百分比形式展示。