SQL Programming Language

The language every developer must know. Query, transform, and manage data.

Overview

Practical SQL tutorials covering SELECT to advanced window functions, query optimization, indexing strategies, and database design principles.

Current stable version
SQL:2023
First released
1974
Programming paradigms
Declarative, Set-Based
Primary use cases
Databases, Analytics, Reporting, Data Engineering

SQL Tutorials

Intermediate

  • SQL Window Functions: The Complete Guide with Real Examples

    Master SQL window functions with 30+ real examples. Covers OVER, PARTITION BY, frame clauses, ROW_NUMBER, RANK, DENSE_RANK, NTILE, LAG, LEAD, FIRST_VALUE, LAST_VALUE, running totals, and moving averages. Tested in PostgreSQL and MySQL 8+.