If you’d like to know what SQL is, this site is for you.
If you already have an idea what SQL is, but want to learn how to write queries in this language, this site is for you.
If you think you’re already quite skilled in SQL query writing, don’t quit this site immediately. There is a good chance you will discover something new.
If you don’t know how and using what server to write queries, this site probably is exactly what, for a long time, you have been looking for. Queries can be executed* against sample databases directly on site.
If everything seems clear to you in this textbook, test your skills using exercises from SQL-EX.RU.
We hope the site will prove useful both for beginners and professionals of SQL programming.
The queries you run from the textbook are processed by a real DBMS. For now, it is Microsoft SQL Server, but we consider** implementing other database servers, both distributed free of charge and commercial products, such as:
By doing so, we plan to make studying SQL dialects features of different DBMS possible.
However, you already can run your queries not only against MS SQL Server, but also against MySQL and PostgreSQL using the console.
* Registration/signing in is required.
** You can send us your comments and suggestions using the contact form.