Articles by tag: SQL

Databases: SQL, NoSQL and Java developer tools

We analyze the choice between relational and non-relational DBMS, SQL features and Java tools. Learn how to optimize data access. Read the guide!

Data Scientist from Scratch: Free Program

Master Data Science for free in 8–10 months. Complete roadmap: from CS basics to TensorFlow and AirFlow. Start learning and look for junior vacancies today.

SQL Trainer: Practice Queries for Developers

Master SQL on real tasks in an interactive trainer. Modules on online store and library with JOIN, aggregations. For middle/senior dev and analysts. Start practice without theory right now.

SQL Courses 2026: Choosing Training for IT Specialists and Analysts

Review of the Best SQL Courses in 2026 Taking into Account AI Integration. Selection Criteria, Skills for Developers and Analysts, Job Market Prospects.

Data Types for Passport and Identifiers in SQL: Storage Errors

Learn why passport and other identifiers should be stored as strings, not numbers in SQL. Avoid loss of leading zeros and data errors. Read the guide for developers.