select uid, exam_id, round(avg(score),0) as avg_score from exam_record where uid in (select uid from user_info where nick_name rlike '^牛客[0-9]+号$' or nick_name rlike '^[0-9]+$') and exam_id in (select exam_id from examination_info where tag rlike '^[cC]') and score is not null group by uid, exam_id order by uid, avg_score
rlike 常用的正则表达式模式:
.
:匹配任意单个字符。^
:匹配字符串的开始。$
:匹配字符串的结束。*
:匹配零个或多个前面的元素。+
:匹配一个或多个前面的元素。?
:匹配零个或一个前面的元素。[abc]
:匹配字符集中的任意一个字符。[^abc]
:匹配除了字符集中的任意一个字符以外的字符。[a-z]
:匹配范围内的任意一个小写字母。[0-9]
:匹配一个数字字符。\w
:匹配一个字母数字字符(包括下划线)。\s
:匹配一个空白字符。