列がケースとして作成された場合where句で結果が機能しない場合

Question

動的に作成された列に基づいて値をフィルタリングしようとしていますが、機能していない場合は、さらに進んでください。

SELECT proj.is_active,pal.Project_Artifact_Id, 
     CASE WHEN pal.artifact_status IN ('Closed', 'Verified','Rejected') 
       THEN 'COM' 
      WHEN pal.artifact_status IN ('In Progress') 
       AND (pal.due_date = getDate() OR pal.due_date = (Getdate()+2)) 
       THEN 'OD' 
      WHEN pal.artifact_status IN ('In Progress') AND pal.due_date > (Getdate()+2) 
       THEN 'CR' 
     END AS Filter_Status 
FROM Project_Artifact_List pal, 
    Projects proj 
WHERE proj.project_code = pal.Project_Code 
    AND Filter_Status IN ('CR'); 

更新

invalid column name error message comes 

Answer 1

あなたは、WHERE句で列の別名にアクセスすることはできません。まず、派生テーブルでクエリをラップ：

select * 
from 
( 
    SELECT proj.is_active,pal.Project_Artifact_Id, 
      CASE WHEN pal.artifact_status IN ('Closed', 'Verified','Rejected') 
        THEN 'COM' 
       WHEN pal.artifact_status IN ('In Progress') 
        AND (pal.due_date = getDate() OR pal.due_date = (Getdate()+2)) 
        THEN 'OD' 
       WHEN pal.artifact_status IN ('In Progress') AND pal.due_date > (Getdate()+2) 
        THEN 'CR' 
      END AS Filter_Status 
    FROM Project_Artifact_List pal, 
     Projects proj 
    WHERE proj.project_code = pal.Project_Code  
) dt 
WHERE Filter_Status IN ('CR'); 

Answer 2

;with cte as 
(

    SELECT proj.is_active,pal.Project_Artifact_Id, 
      CASE WHEN pal.artifact_status IN ('Closed', 'Verified','Rejected') 
        THEN 'COM' 
       WHEN pal.artifact_status IN ('In Progress') 
        AND (pal.due_date = getDate() OR pal.due_date = (Getdate()+2)) 
        THEN 'OD' 
       WHEN pal.artifact_status IN ('In Progress') AND pal.due_date > (Getdate()+2) 
        THEN 'CR' 
      END AS Filter_Status 
    FROM Project_Artifact_List pal, 
     Projects proj 
    WHERE proj.project_code = pal.Project_Code 

) 
select * from cte 
WHERE Filter_Status IN ('CR') 

Answer 3

CASEはProject_Artifact_Listのみに依存、あなたはCROSSは、それはあなたがフィルタリングすることはできませんWHERE

SELECT proj.is_active,pal.Project_Artifact_Id,  
FROM Project_Artifact_List pal 
CROSS APPLY (SELECT 
      CASE WHEN pal.artifact_status IN ('Closed', 'Verified','Rejected') 
       THEN 'COM' 
      WHEN pal.artifact_status IN ('In Progress') 
       AND (pal.due_date = getDate() OR pal.due_date = (Getdate()+2)) 
       THEN 'OD' 
      WHEN pal.artifact_status IN ('In Progress') AND pal.due_date > (Getdate()+2) 
       THEN 'CR' 
     END AS Filter_Status) fs 
    , Projects proj 
WHERE proj.project_code = pal.Project_Code 
    AND fs.Filter_Status IN ('CR');