使用具有多个语句的单个公用表表达式

Question

数据库

DB2

脚本

我必须得到IDs和DELETE FROM...两个表的列表。我从CTE获得所有ID，但我只能在一个DELETE声明中使用它。我必须再次查询CTE以获得其他DELETE。

现行解决方案

-- GET A LIST OF ALL CHILDREN OF A NODE, INCLUDING A NODE
WITH NODE_LIST (ID) AS
(
    -- CHILDREN
    SELECT n.ID FROM NODE n WHERE n.ID = '8ae433156f7f4469857e7de205ec4fe0'
    UNION ALL
    SELECT n.ID FROM NODE n, NODE_LIST nl WHERE nl.ID = n.PARENT
)
SELECT COUNT (*) FROM OLD TABLE(
    DELETE FROM FIRST_NODE_TABLE ns WHERE EXISTS (SELECT * FROM NODE_LIST nl WHERE nl.ID = ns.CHILD OR nl.ID = ns.PARENT)
);

WITH NODE_LIST (ID) AS
(
    SELECT n.ID FROM NODE n WHERE n.ID = '8ae433156f7f4469857e7de205ec4fe0'
    UNION ALL
    SELECT n.ID FROM NODE n, NODE_LIST nl WHERE nl.ID = n.PARENT
)

SELECT COUNT (*) FROM OLD TABLE(
    DELETE FROM SECOND_NODE_TABLE n WHERE EXISTS (SELECT * FROM NODE_LIST nl WHERE nl.ID = n.ID)
);

请求

我想只有一个NODE_LIST或尽可能简化查询。