候选者：B+树相对于B树而言，它又有两种特性。候选者：一、B+树非叶子节点不存储数据，在相同的数据量下，B+树更加矮壮。（这个应该不用多解释了，数据都存储在叶子节点上，非叶子节点的存储能存储更多的索引，所以整棵树就更加矮壮）候选者：二、B+树叶子节点之间组成一个链表，方便于遍历查询（遍历操作在MySQL中比较常见）候选者
WHERE AnswerResult.用户标识 = {UserId} ) 针对只做错的题目出题练习就简单了(正确次数 = 0代表只做错),SQL如: B:SELECT 题目标识 FROM AnswerResult INNER JOIN Question AND Question.知识点={KnowledgePointCode} WHERE AnswerResult.用户标识 = {UserId} AND 正确次数 = 0 ORDER BY 错误次数 DESC 若要...
比如update/delete/insert/truncate/create。在MySQL中，主从同步实际上就是应用了binlog来实现的（：...
p.titleastitle, p.questionasquestion, p.answerasanswer, p.crt_timeascrtTimefrompd_problem pjoin(SELECTROUND(RAND()*((SELECTMAX(pp.id)FROMpd_problem pp)-(SELECTMIN(pp.id)FROMpd_problem pp))+(SELECTMIN(pp.id)FROMpd_problem pp))ASpid)ASp2wherep.id>=p2.pidandp.is_valid='1'andp.p...
Re: Simple question, looking for a simple answer Drew Patton January 17, 2008 08:11PM Sorry, you can't reply to this topic. It has been closed. Content reproduced on this site is the property of the respective copyright holders. It is not reviewed in advance by Oracle and does not nec...
1 answer One of the answers was accepted by the question author. We are managing an Azure Database for MySQL and we received an alert that CPU usage has spiked to 90% and stayed high for the last 30 minutes. The application team says the database performance has become very slow. How ...
Over three months we had the chance to design and implement a question answering project with Serviceware SE.Question Answering is a common task in natural language processing („NLP“) — a subfield of machine learning — in which the system processes a question and retrieves an answer for...
TypeNameDescription System.String username System.String password System.String newPasswordQuestion System.String newPasswordAnswer ReturnsTypeDescription System.Boolean OverridesSystem.Web.Security.MembershipProvider.ChangePasswordQuestionAndAnswer(System.String, System.String, System.String, System.String)...
drop table if exists user_profile; CREATE TABLE `user_profile` ( `id` int NOT NULL, `device_id` int NOT NULL, `gender` varchar(14) NOT NULL, `age` int , `university` varchar(32) NOT NULL, `gpa` float, `active_days_within_30` int , `question_cnt` float, `answer_cnt` float ...
Re: Disappearing database - Does anyone know the answer to this question?Posted by: Johnny Smith Date: September 03, 2007 06:53PM The entire directory doesn't get removed, which you can see in my original post where I listed the directory contents before and after. Only the mysql and ...