MySQL interview questions and answers for freshers and experience job seekers. MySQL data type, indexes, sub query, sequences, joins, union, view, store procedures, cursors, triggers, transactions, optimizing performance related interview questions.
PHP-MySQL InterviewQuestionLast few days I havebeen working to compile a question and answer set for PHP-MySQLinterview questions. There are roughly 150 questions and i will be adding more as days to come.These questions and answers are compiled from different online resources. I am planning ...
Write a SQL query to get the third-highest salary of an employee from Employee_Details table as illustrated below. 编写一个SQL查询以从Employee Details表中获取该雇员的第三高薪资,如下所示 Example Table – Data Analyst Interview Questions SELECT TOP 1 SalaryFROM(SELECT TOP 3 SalaryFROM Employee_De...
This is one of the significant MySQL query interview questions. For this, an ALTER TABLE query is required. Once invoked, simply mention the column and its definition. Something like this: ALTER TABLE cars ADD COLUMN engine VARCHAR(80) AFTER colour; The ALTER TABLE statement is operated to ad...
As a beginner, you must be ready to face such MySQL interview questions and answers for freshers. 54. What query is used to display the top 20 rows? It is one of the top interview questions on MySQL queries that can be asked to experienced professionals. ...
use for each of these commands. The only way you’ll remember it is through hands-on experience, so start developing your next MySQL application today and develop deeper insights withMySQL Courses. And if you just need to brush up, check out some of the most commonMySQL interview questions....
If you learn the knowledge well, of course you have to go for an interview, enter a big factory, and get a high salary. But before entering the interview, the necessary preparations are necessary, and brushing the questions is one of them. ...
性能分析工具: 使用性能分析工具(如Percona Toolkit、pt-query-digest等)来分析慢查询的执行计划、索引使用情况等,帮助定位慢查询的原因和优化方向。 EXPLAIN语句: 使用EXPLAIN语句来查看SQL语句的执行计划,分析索引使用情况、表扫描方式等,从而找出慢查询的性能瓶颈。 系统视图和表: MySQL提供了一些系统视图和表(如infor...
You can use it as an online tool for MySQL exercises and interview preparation. You can use it as a personal MySQL sandbox and playground. There is an unlimited amount of scenarios that you can use our MySQL compiler to practise your SQL. Have Fun!Cookie...
上面的大部分命令都可以用like,比如 show table like ‘%abce%’ 。 附: show status 结果说明 show index 结果说明: show variables 结果说明: 关于上面的一些注释: 如果Opened_tables太大,那么你的table_cache变量可能太小。 如果key_reads太大,那么你的key_cache可能太小。缓存命中率可以用key_reads/key_rea...