下面是我的递归查询,用于获取每个孩子的孩子和孩子,但执行时间太长。我怎样才能优化这个查询,以便它可以更快地执行。如果我删除不同的,它会带来多条记录。
DECLARE @int_UserID INT
DECLARE @ProjectID INT
SET @int_UserID=74
SET @ProjectID=96
;WITH Records AS (
SELECT pu.int_USER_ID,alh.int_Level_ID
FROM tbl_PROJECT_USER pu INNER JOIN tbl_Project_User_Role pur ON pu.int_USER_ROLE = pur.int_Project_User_Role_ID
INNER JOIN tbl_Access_Level_Hierarchy alh ON pur.int_Access_Level_IDRef=alh.int_Level_ID
INNER JOIN tbl_USER u ON u.int_USER_ID=pu.int_USER_ID
WHERE pu.int_USER_ID=@int_UserID AND pu.int_PROJECT_ID=@ProjectID
UNION ALL
SELECT pu.int_USER_ID,alh.int_Level_ID
FROM tbl_PROJECT_USER pu INNER JOIN tbl_Project_User_Role pur ON pu.int_USER_ROLE = pur.int_Project_User_Role_ID
INNER JOIN tbl_Access_Level_Hierarchy alh ON pur.int_Access_Level_IDRef=alh.int_Level_ID
INNER JOIN Records R ON R.int_Level_ID=alh.int_Level_Order
WHERE pu.int_PROJECT_ID=@ProjectID
)
SELECT DISTINCT * FROM Records
OPTION(MAXRECURSION 0)
谢谢大家。通过改变一些逻辑,我得到了最佳解决方案。