无效的标识符IN_LIBRARY

Question

无法确定为什么在运行查询时出现此错误

我遇到错误：

  

无效的标识符IN_LIBRARY

  Select distinct ci.Title, ci.publisher, b.isbn, ci.Release_date, b.Pages, 
  IN_LIBRARY,
  case when exists( select * from Physical_Item where pi.catalog_item_id 
  =ci.catalog_item_id) 
  then 'yes' else 'No' 
  end
  as IN_LIBRARY
  from Catalog_Item ci
  left join book b on ci.CATALOG_ITEM_ID = b.Catalog_item_ID
  left join physical_item pi
  on pi.catalog_item_id =ci.CATALOG_ITEM_ID 
  order by ci.title;

Answer 1

在案例陈述前的选择列表中删除IN_LIBRARY，更正了以下查询：

Select distinct ci.Title, ci.publisher, b.isbn, ci.Release_date, b.Pages,
  case when exists( select * from Physical_Item where pi.catalog_item_id 
  =ci.catalog_item_id) 
  then 'yes' else 'No' 
  end
  as IN_LIBRARY
  from Catalog_Item ci
  left join book b on ci.CATALOG_ITEM_ID = b.Catalog_item_ID
  left join physical_item pi
  on pi.catalog_item_id =ci.CATALOG_ITEM_ID 
  order by ci.title;