优化SQL查询...

Question

我有我的表中的数据如下：

Author ID Book Name 

A1 Book1 

A1 Book2 

A2 Book4 

A2 Book5 

我要代表数据

A1 Book1,Book2 

A2 Book3,Book5 

我怎样才能这样做，而不使用临时表？

Answer 1

这个问题已经提出并回答了。在发布之前检查问题。

根据您的专栏编辑此代码。

Reference

Select T1.Id 
    , Stuff(
     (
     Select ', ' + T2.Address 
     From MyTable As T2 
     Where T2.Id = T1.Id 
     Order By T2.Address 
     For Xml Path(''), type 
     ).value('.', 'nvarchar(max)'), 1, 2, '') As Address 
From MyTable As T1 
Group By T1.Id