随笔分类 - 知识库.数据库

sql 合并

摘要：Create table Tab([Col1] int,[Col2] nvarchar(1)) Insert Tab select 1,N'a' union all select 1,N'b' union all select 1,N'c' union all select 2,N'd' union all select 2,N'e' union all select 3,N'f' Go sele... 阅读全文

posted @ 2010-08-24 14:42 Young跑跑阅读(210) 评论(0) 推荐(0) 编辑

数据库（1）

摘要：什么是声明式语言A： Programming models. In SQL, we write queries, and so we have a higher-level,declarative way of expressing the set of data that we're interested in. With imperative programming languages ... 阅读全文

posted @ 2009-10-17 12:38 Young跑跑阅读(217) 评论(0) 推荐(0) 编辑