Top MySQL Interview Questions & Answers for All Levels
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07 Jan, 2025
Most Frequently asked MySQL Interview Questions and Answers
A deadlock in MySQL occurs when two or more transactions are blocked, each waiting for the other to release locks on resources (such as rows or tables). This creates a circular dependency, where no transaction can proceed because each transaction is holding a lock that the others need.
07 Jan, 2025
MySQL Interview Questions (2025)
MySQL is an open-source relational database management system (RDBMS) that uses Structured Query Language (SQL) to manage and manipulate relational databases. It is one of the most popular databases, known for its speed, reliability, and ease of use. MySQL is commonly used in web applications and has been a key component of the LAMP stack (Linux, Apache, MySQL, PHP/Perl/Python).
07 Jan, 2025
MySQL Interview Questions and Answers for 2025
A subquery in MySQL is a query nested inside another query. It allows you to perform a query within the context of another query, often to retrieve data that will be used in the outer query. Subqueries can be used in the SELECT, INSERT, UPDATE, or DELETE statements and can help with complex queries where a direct comparison or condition is needed.
07 Jan, 2025
MySQL Interview Questions for Developers
MySQL handles transactions using the ACID properties, ensuring that database operations are reliable, consistent, and recoverable. A transaction in MySQL is a sequence of one or more SQL operations that are executed as a single unit of work. If any of the operations fail, the entire transaction can be rolled back to maintain data integrity.
07 Jan, 2025
MySQL Interview Questions and Answers
In the context of MySQL, ACID stands for Atomicity, Consistency, Isolation, and Durability. These are a set of properties that guarantee that database transactions are processed reliably and ensure data integrity even in the event of failures (like power outages, system crashes, or software bugs). Let's go over each ACID property in detail:
07 Jan, 2025
Top MySQL Interview Questions (2025)
The GROUP BY clause in MySQL is used to group rows that have the same values in specified columns into summary rows, often used with aggregate functions like COUNT(), SUM(), AVG(), MIN(), and MAX() to perform calculations on each group. Essentially, it allows you to aggregate data across multiple rows and summarize it into a smaller set of results.
07 Jan, 2025
Top MySQL Interview Questions and Answers for 2025
In MySQL, a storage engine is responsible for how data is stored, retrieved, and manipulated in the database. MySQL supports several storage engines, each designed for different use cases and offering specific features. The storage engine determines things like data integrity, speed, transaction support, and indexing.
26 Dec, 2024