随笔分类 -  知识库.数据库

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

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