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Databases

EN: All about databases, SQL and database software
DE: Alles über Datenbanken, SQL und Datenbank-Software
RU: All about databases, SQL and database software

Preface

The author has written this SQL-help in his free time because a quick and permanently online SQL-tutorial was needed. This is only a part of the whole SQL-standart, for more information about its implementations on different database systems please contact the software manyfacturers. The "Standard-SQL", first developed by IBM, was improved by software firms that develop relational database management systems (RDBMS). But all of this improvements can not be discussed in an brief help file. The small table after the command/keyword indicates in some cases, in wich system this command/keyword is implemented.

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Copyright and Warranty

Copyright © 2004 by André Müller. This Object is open source. You can redistribute it and/or modify it under the terms of the Universal General Public License (UGPL).

Here some important parts of the UGPL:

Distribution Concerns

You may not copy, modify, sublicense, or distribute the Object except as expressly provided under this License. Any attempt otherwise to copy, modify, sublicense or distribute the object is void, and will automatically terminate your rights under this License. However, parties who have received copies, or rights, from you under this License will not have their licenses terminated so long as such parties remain in full compliance.

SQL - Tutorial and Reference (EN)

This is an attempt to introduce you to SQL and to explain what relational databases are, what the relational datamodell is and how you can extract data from databases with SQL. -- english, deutsch, russian --

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