This is one of the prevalent MySQL queries interview questions for both beginner and experienced candidates. A foreign key is used to connect two tables. A FOREIGN KEY is a field (or assortment of it) in one table that alludes to the PRIMARY KEY in another table. The FOREIGN KEY requireme...
This is among the crucial interview questions on MySQL that is a bit technical, but you must know the correct answer. 27. What is a Stored Procedure in MySQL? A stored procedure in MySQL is a group of SQL statements saved in the database. SQL queries such as INSERT, UPDATE, DELETE, a...
One potential drawback of using MySQL is that it can be difficult to use for complex queries. It can also be slow when used with large datasets. MySQL also doesn’t have the customer support that other similar products do because it’s not a commercial product; it’s an open-source prod...
event_date) = -1 ## Ref: https://lifewithdata.com/2021/08/03/sql-interview-questions-leetcode-550-game-play-analysis-iv/11 - 571H 给定数字的频率查询中位数 Find Median Given Frenquency of Numbers此题的一个经典解法是,找出那些不管是正序累积频数求和,还是逆序累积频数求和的数字,进行平均即可...
Shows all active queries on the server.This will show you what you need to know if the system is running sluggishly. 21. KILL <query_id> Kills a specific active query identified by its unique ID.You would do this if a query was hanging for some reason, such as getting stuck in a lo...
MySQL Troubleshooting: What To Do When Queries Don't Work (2012)by Sveta Smirnova Oracle Database 11g & MySQL 5.6 Developer Handbook (Oracle Press) (2011)by Michael McLaughlin Effective MySQL Optimizing SQL Statements (Oracle Press) (2011)by Ronald Bradford MySQL Administrator's Bible (2009)by ...
MySQL Troubleshooting: What To Do When Queries Don't Work (2012)by Sveta Smirnova Oracle Database 11g & MySQL 5.6 Developer Handbook (Oracle Press) (2011)by Michael McLaughlin Effective MySQL Optimizing SQL Statements (Oracle Press) (2011)by Ronald Bradford MySQL Administrator's Bible (2009)by ...
Solution 1: If you require a quick fix, avoid executing these queries during runtime. Currently, the query takes approximately 2 seconds, which, although not a significant delay, is the slowest among all other queries on my site, as they all take less than 0.5 seconds. ...
SELECT processid, desc FROM table_name WHERE processid IN ('12345','12345', '48373'); The result is: 12345 name 48373 name2 But I want: 12345 name 12345 name 48373 name2 Solution 1: In order to obtain the records in the specified order mentioned in yourINclause, you must transfer ...
Interview Questions: Prepare for job interviews with a curated set of MySQL questions and answers. FAQs: Get quick answers to common challenges and frequently asked questions about MySQL. Whether you're learning database management for your career or building your first project, "Learn MySQL Databa...