SQL Interview Questions Your Guide to Success
SQL (Structured Query Language) is the foundation of data management and analysis, making it a critical skill for database administrators, data analysts, and backend developers. Jobpe offers a curated collection of SQL interview questions, real-world scenarios, and expert guidance to help you excel in your next technical interview.
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- Database Fundamentals
What is a database and why is it important?
A database is an organized collection of structured information or data, typically stored electronically in a...
Explain the difference between a database and a database management system (DBMS).
A database is the actual collection of data, while a Database Management System (DBMS) is the software that allows...
What is a primary key in a database?
A primary key is a column or combination of columns that uniquely identifies each row in a database table. It...
What is a database schema?
A database schema is a blueprint that defines the logical structure of a database, including tables, fields,...
What are database constraints?
Database constraints are rules enforced on data columns to maintain data integrity. Common types include NOT NULL,...
What are the main components of a relational database?
The main components of a relational database include tables, rows, columns, keys, indexes, views, stored procedures,...
Database Fundamentals
What is a database and why is it important?
A database is an organized collection of structured information or data, typically stored electronically in a computer system. It allows efficient data storage, retrieval, management, and analysis, enabling businesses and organizations to manage large amounts of information systematically.
Explain the difference between a database and a database management system (DBMS).
A database is the actual collection of data, while a Database Management System (DBMS) is the software that allows users to define, create, maintain, and control access to the database. DBMS provides an interface between the database and its end-users or application programs.
What is a primary key in a database?
A primary key is a column or combination of columns that uniquely identifies each row in a database table. It ensures that no two rows have the same identifier and provides a way to establish relationships between tables.
What is a database schema?
A database schema is a blueprint that defines the logical structure of a database, including tables, fields, relationships, views, indexes, and other database objects. It serves as a framework for organizing and representing data in a systematic manner.
What are database constraints?
Database constraints are rules enforced on data columns to maintain data integrity. Common types include NOT NULL, UNIQUE, PRIMARY KEY, FOREIGN KEY, CHECK, and DEFAULT constraints, which ensure data accuracy and consistency.
What are the main components of a relational database?
The main components of a relational database include tables, rows, columns, keys, indexes, views, stored procedures, and relationships. These elements work together to organize, store, and manage structured data efficiently.
