Question

此查询是大型查询的子集，其中我OUTER APPLY表示一堆值，以便稍后过滤掉结果

我有一些数据：

Table: Items
        ID  |   Material   |  Form
    ----------------------------------
        1   |   Aluminium  |  Sheets
       ------------------------------
        1   | Carbon Steel |  Bars
       ------------------------------
        2   |   Aluminium  |  Bars

我想找到满足给定输入的匹配ID。输入可以是三种形式之一，并且可以有一行或多行。当输入有多行时，该项必须满足所有行。输入的例子如下：

@Input type 1: (just a material, one or multiple allowed)    
    Material     |  Form
    -------------------
    Aluminium    |  NULL

@Input type 2: (material and a form, one or multiple allowed)   
    Material     |  Form
    -------------------
    Aluminium    |  Sheets

@Input type 3: (one or more material and form, with one or more materials)  
    Material     |  Form
    -------------------
    Aluminium    |  Sheets
    Carbon Steel |  NULL

我编写了一个可以处理输入类型1的查询和一个输入类型2的查询，但我需要将它们组合起来，并且能够处理输入类型3.

查询输入类型1：

Select *
From table

OUTER APPLY(
  SELECT top(1) i.Material
  FROM @Input i --Input type 1
  WHERE i.Material NOT IN
    (SELECT items.Material
    FROM Items
    WHERE items.id = table.id)
)MaterailCondition

--this makes sure that there isn't anything selected that does not match Material
WHERE MaterialCondition.Material IS NULL

查询输入类型2：

Select *
From table

OUTER APPLY(
  SELECT top(1) i.Material, i.Form
  FROM @Input i --Input type 1
  WHERE i.Material NOT EXISTS
    (SELECT *
    FROM Items
    WHERE items.id = table.id
    AND items.Material = i.Material
    AND items.Form = i.Form)
)MaterailCondition

--this makes sure that there isn't anything selected that does not match Material
WHERE MaterialCondition.Form IS NULL

此时，我需要能够

将查询合并到相同的外部应用程序块
住宿输入类型3

任何帮助将不胜感激！此外，如果我可以解释任何事情，或者对此有任何更明确的解释，请告诉我。我尽量保持简洁和专注。

修改

这是查询所需的输出

ID  |  Name      |  MaterialCondition.Material
-------------------------------------------
23  | Some Item  |  (any text, such as 'Carbon Steel') <-- This is not a match
12  | Other Item |  NULL                               <-- This IS a match

--(the where clause will filter these out, by saying)
WHERE MaterialCondition.Material IS NULL

所以只返回ID号码：

ID  |  Name      |  MaterialCondition.Material
-------------------------------------------
12  | Other Item |  NULL

Answer 1

到目前为止，我已经达到了一个功能状态，就像这样：

Select *
From table
OUTER APPLY(  
 SELECT top(1) i.Material  
 FROM @Input i --Input type 1  
 WHERE i.Material NOT IN    
  (SELECT items.Material    
  FROM Items    
  WHERE items.id = table.id)
)MaterailCondition

OUTER APPLY(  
 SELECT top(1) i.Material, i.Form  
 FROM @Input i --Input type 1  
 WHERE i.Material NOT EXISTS    
  (SELECT *    
  FROM Items    
  WHERE items.id = table.id    
  AND items.Material = i.Material    
  AND items.Form = i.Form)
)MaterailCondition2

--this makes sure that there isn't anything selected that does not match Material
WHERE MaterialCondition.Material IS NULL AND MaterialCondition2.Form IS NULL

这将正常工作，我有一个外部申请输入类型1和输入类型2，然后外部申请将照顾他们各自的输入类型3的部分。我想我只是希望包含这个一个OUTER APPLY

内的逻辑

从输入中选择数据库中不存在的项目

1 个答案: