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SQL

Get started with databases—from choosing your programming language to understanding stored procedures—by watching our SQL tutorials. Whether you want to execute a SQL transaction, run SQL queries, or master database administration, these video courses can help you get up and running.

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Frequently asked questions

What is SQL?

SQL, or Structured Query Language, is a domain-specific language used for managing and manipulating relational databases. It is employed for tasks such as querying data, defining and modifying database structures, and controlling access to the stored data.
Which are the basic operations in SQL?

SQL supports several fundamental operations, including SELECT (retrieve data), INSERT (add new data), UPDATE (modify existing data), DELETE (remove data), and CREATE/ALTER/DROP (manage database structure).
What is the difference between SQL and MySQL?

SQL is a language, while MySQL is a relational database management system (RDBMS) that uses SQL. MySQL is one of many database systems that implement the SQL language. Other examples include PostgreSQL, SQLite, and Microsoft SQL Server.
Explain the primary key in SQL.

A primary key in SQL is a unique identifier for a record in a table. It ensures each row has a distinct identity, and it is often used to establish relationships between tables. The primary key constraint enforces the uniqueness and non-null properties of the key.
What is normalization in SQL databases?

Normalization is the process of organizing data in a database to reduce redundancy and dependency. It involves dividing large tables into smaller, more manageable tables and defining relationships between them. Normalization helps maintain data integrity and avoids data anomalies.

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