SQL - 使用WHERE語句

Question

HI，

WITH狀態是否可以存在於WHERE子句中？

例如：

SELECT tbl1.name , tbl1.ID 
FROM DBTABLE0001 AS tbl1 
WHERE ( 
    exists(

     WITH H (super, ID, depth) AS 
     ( 
     SELECT ROOT.parent, ROOT.ID , 0 
     FROM DBTABLE0001 ROOT 
     WHERE ROOT.ID = tbl1.ID 

     UNION ALL 

     SELECT PARENT.parent, PARENT.ID , CHILD.depth + 1 
     FROM H CHILD, DBTABLE0001 PARENT 
     WHERE PARENT.ID = CHILD.super 

     ) 

     SELECT ID 
     FROM H 
     WEHER H.ID = "abcd" 
     ORDER BY depth 

    ) 
) 

感謝， 密蘇里州

Answer 1

你應該把你與你的查詢的開頭陳述。那麼你可以在任何地方使用它：

WITH H (super, ID, depth) AS   
      (SELECT ROOT.parent, ROOT.ID , 0 
        FROM DBTABLE0001 ROOT    
       WHERE ROOT.ID = DBTABLE0001.ID    
       UNION ALL    
       SELECT PARENT.parent, PARENT.ID , CHILD.depth + 1       FROM H CHILD, DBTABLE0001 PARENT   
       WHERE PARENT.ID = CHILD.super) 

SELECT tbl1.name , tbl1.ID  
    FROM DBTABLE0001 AS tbl1 
    WHERE (exists(SELECT ID FROM H WEHER H.ID = "abcd" ORDER BY depth))