SQL (Structured Query Language) is the backbone of managing and manipulating data in relational databases. Whether you’re just starting your career in tech or looking to brush up on your skills, mastering SQL is crucial. To help you on your journey, we’ve compiled a comprehensive list of 100 beginner-level SQL interview questions. Whether you’re preparing for an interview or simply want to reinforce your SQL knowledge, these questions will guide you through the fundamental concepts and techniques.
1. What is SQL and what does it stand for?
SQL stands for “Structured Query Language.” It is a domain-specific language used to manage, manipulate, and query relational databases.
2. Define a database and its purpose
A database is a structured collection of data that is organized and stored for easy retrieval and management. Its purpose is to store, manage, and retrieve information efficiently.
3. Explain the role of a table in a database
A table is a fundamental component of a database where data is stored in rows and columns. It represents a specific entity or concept, and each row in a table corresponds to a record, while each column represents a data attribute.
4. What is a column in a table?
A column, also known as a field, is a vertical arrangement in a table that represents a specific data attribute. It holds values of the same data type for each row.
5. Define a row in a table.
A row, also known as a record or tuple, is a horizontal arrangement in a table that contains a set of related data values. Each row corresponds to a single instance or entry.