Nowadays, the Internet industry uses MySQL the most. However, for advanced Web interviewers, especially for job seekers looking for jobs under 30k, many MySQL-related knowledge points will be basically involved. If during the interview, your relevant knowledge answers are vague and irrelevant. Basically, most interviewers from better companies will not be interested in you. After all, a slightly larger project will eventually let you go deep into the database, and most of the final bottlenecks will first appear in the database. Here to share 54 MySQL frequently asked interview questions and 21 SQL tuning experience to everyone!
27 MySQL Frequently Asked Interview Questions
27 classic MySQL interview questions
Answer sharing
Since the answer is too long, I have compiled it into a document, if you need it, you can privately message me to get a free way!
21 MySQL performance tuning experiences (compiled documents for free sharing)
- Optimize your queries for query caching
- EXPLAIN your SELECT query
- Use LIMIT 1 when only one row of data is required
- Index the search field
- Use a similar type of example in the Join table and index it
- Never ORDER BY RAND()
- Avoid SELECT *
- Always set an ID for each table
- Use ENUM instead of VARCHAR
- Get advice from PROCEDURE ANALYSE()
- Use NOT NULL whenever possible
- Prepared Statements
- Unbuffered query
- Save the IP address as UNSIGNED INT
- Fixed-length tables will be faster
- Vertical split
- Split large DELETE or INSERT statements
- The smaller the column, the faster
- Choose the right storage engine
- Use an Object Relational Mapper
- Beware of "permalinks"
Make progress together and encourage each other
Share 400 well-organized Java system interview questions integration documents (with detailed answers)
Because there are too many answers to the questions, I organized these two SQL data into documents and shared them for free. Friends in need can add me [VX Assistant] to get a free collection method after one-click triple connection!
More Java notes documentation is as follows
