在CTE SQL查询中使用Union子句时出错

Question

I'm trying to do following but getting an max recursive error. Can someone please help?

Sample code to demonstrate what I'm trying to achieve:

DECLARE @SecurityMaster AS TABLE
(
    ID              INT,
    SecurityAlias   INT,
    LegNumber       INT
)

INSERT INTO @SecurityMaster
SELECT 12829, 3030106, NULL 
UNION ALL
SELECT 12829, 3030107, 1

SELECT * FROM @SecurityMaster;

WITH CTE1 (ID, SecurityAlias, LegNumber)
AS
(
    SELECT S.ID, S.SecurityAlias, S.LegNumber
    FROM @SecurityMaster S 
    WHERE S.LegNumber IS NOT NULL

    UNION ALL

    select s.ID, s.SecurityAlias, s.LegNumber
    from @SecurityMaster S inner join CTE1 c on s.ID = c.ID
    where s.LegNumber is NULL
)

SELECT *
FROM CTE1;

Result I'm expecting:

ID          SecurityAlias       LegNumber
-----------------------------------------
12829       3030107             1
12829       3030106             NULL

Answer 1

Your questionis difficult to understand, but will this work for you?

select s.ID, s.SecurityAlias, s.LegNumber
from @SecurityMaster S
where s.LegNumber is NULL
And s.id in (SELECT f.ID
FROM @SecurityMaster f
WHERE f.LegNumber IS NOT NULL)