If you want to know what SQL is, this site is intended for you.
If you already have an idea, what SQL is, but want to learn how to program queries in this language, this site is for you.
If you think that you can program queries, don’t quit the site immediately. It is quite possible that you will discover something new for you.
If you do not know how and using which server to write queries – this site is what you have been looking for ages. You will be able to execute* queries against sample databases on site.
If everything seems clear to you in this textbook, examine your knowledge using tests from SQL-EX.RU.
We hope that the site will prove useful both for beginners and professionals of SQL programming.
The queries inside of the e-book are processed by real DBMS. So far it is Microsoft SQL Server, but we consider** the possibility of using other database servers, beginning with those in free sale and finishing with commercial products:
so that it was possible to study features of dialects of SQL language in different DBMS.
However already now you can write queries not only to MS SQL Server, but also to MySQL and PostgreSQL, using the console.
* Registering/authorization is required.
** Your can send your comments and wishes by post.