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SQL Server 2000 В принципе, если посмотреть на эту таблицу, то можно заметить, что в ней также перечислены встроенные типы данных. То есть и типы данных, выглядящие встроенными, на уровне конкретной базы данных являются пользовательскими, но имеющими те же свойства и имена, что и встроенные. Например, выберем из таблицы sys ypes базы данных pubs список доступных типов данных: SELEC ame FROM sys ypes Будет возвращен следующий результат: ame image ex u iqueide ifier i yi smalli i smallda e ime real mo ey da e ime floa sql varia ex bi decimal umeric small mo ey bigi varbi ary varchar bi ary char imes amp varchar char sys ame id id empid (29 row(s) affec ed) Как видно, в одной таблице перечислены и встроенные, и пользовательские типы данных (i d, i d и emi d). Управление правилами Правила (rules) являются одним из средств обеспечения целостности данных, хранящихся в базе. Правила оставлены для обеспечения обратной совместимости с предыдущими версиями SQL Server. В новой версии они заменены ограничениями целостности CHECK, которые являются более мощным средством и определяются при создании таблицы. Правила же создаются как отдельные объекты, которые впоследствии связываются с конкретными полями таблиц. | |
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