This textbook appeared as a reference database of SQL-EX.RU project. Therefore special attention is paid to the practice of use of language queries for manipulation of data – SQL DML.
However knowledge of only this sublanguage limits professional skills of the specialist. We are going to further develop the textbook at least in two directions:
Besides, it is planned to regularly update the content of the project, i.e. to reflect changes, taking place within SQL standard and in recent developments of top producers of database management systems.