2012年6月7日
Rows cannot be deleted through a view if the view definition contains the DISTINCT keyword
摘要： Rows cannot be deleted through a view if the view definition contains the DISTINCT keyword 阅读全文
posted @ 2012-06-07 16:59 JJ.Net 阅读(179) 评论(0) 推荐(0)
Constraint Not Null
摘要： You can define constraints syntactically in two ways:As part of the definition of an individual column or attribute. This is called inline specification.As part of the table definition. This is called out-of-line specification.NOT NULL constraints must be declared inline. All other constraints can . 阅读全文
posted @ 2012-06-07 11:15 JJ.Net 阅读(255) 评论(0) 推荐(0)