What is SQL and what is it used for?

SQL, short for Structured Query Language, is the standard language for managing and querying data in relational databases. Analysts use it to read, manipulate, and change data, and it has been the most common way to access database data since the 1970s. You can pull records, filter them, and reshape results all in one place.

Why do analysts prefer SQL over spreadsheets?

Analysts favor SQL because it queries large datasets in place and is easy to audit and replicate. Unlike a spreadsheet, where steps can get buried inside cells, a SQL query documents exactly how you reached your result. It's also quick to pick up relative to the scale of data it handles.

What are tables, rows, and columns in a database?

A table is a structured set of data organized into rows and columns, much like a spreadsheet. Each row is a single record, each column holds one attribute, and a schema groups related tables together. Understanding this structure is the foundation for writing queries.

Do I need to set up a database to start learning SQL?

No, you can start writing SQL in an in-browser editor without setting up a database yourself. This intro focuses on querying existing data rather than installing or configuring database software, so you can practice real queries right away.

SQL Tutorial for Data Analysis: Beginner SQL Guide (2026)

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