Mastering Data with SQL: The Language of Databases

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FAQ

What is SQL?

SQL (Structured Query Language) is a programming language used for managing and querying relational databases.

What is a database?

A database is an organized collection of structured information stored electronically, often managed using SQL.

What are SQL tables?

Tables are structures within a database that store data in rows and columns, similar to a spreadsheet.

What is a primary key in SQL?

A primary key is a unique identifier for each record in a table, ensuring no duplicate rows.

What are SQL queries?

SQL queries are commands used to retrieve, update, delete, or insert data into a database.

What is a JOIN in SQL?

JOIN is a SQL operation that combines rows from two or more tables based on a related column.

What is the difference between INNER JOIN and OUTER JOIN?

INNER JOIN returns only matching records between tables, while OUTER JOIN returns all records, including unmatched ones.

What are SQL data types?

SQL data types define the kind of data a column can hold, such as integers, text, dates, and booleans.

What is a stored procedure in SQL?

A stored procedure is a set of SQL statements stored in the database and executed as a program to perform specific tasks.

What is normalization in SQL?

Normalization organizes a database to reduce redundancy and improve data integrity through table structure design.

What is an index in SQL?

An index is a database structure that speeds up the retrieval of rows by creating a quick access path for data.

How do transactions work in SQL?

Transactions group SQL operations, ensuring that they either fully complete or are fully rolled back to maintain data consistency.

What is the difference between SQL and NoSQL?

SQL databases are structured and relational, while NoSQL databases are non-relational and better suited for unstructured data.

What are SQL aggregate functions?

Aggregate functions (e.g., COUNT, SUM, AVG) perform calculations on data across multiple rows to produce a single result.

What are common SQL commands?

Common SQL commands include SELECT, INSERT, UPDATE, DELETE, and CREATE, each serving different data management purposes.

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