SQL - WHERE 子句中的 With 语句

发布于 2024-11-02 01:27:14 字数 600 浏览 3 评论 0原文

您好，

WITH 状态可以存在于 WHERE 子句中吗？

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

    ) 
)

谢谢，莫。

原文

HI,

Does a WITH state can live in a WHERE clause?

for instance:

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

    ) 
)

Thanks,
Mo.

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︶￣淡然 2024-11-09 01:27:14

您应该将 with 语句放在查询的开头。那么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))

You should place your with statements at the begining of your query. then you can use it every where :

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))

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