小编Vij*_*apa的帖子

谁能帮我理解这个递归 CTE 是如何工作的？

WITH
RECURSIVECTE (EMPID, FULLNAME, MANAGERID, [ORGLEVEL]) AS
    (SELECT EMPID,
            FULLNAME,
            MANAGERID,
            1
     FROM RECURSIVETBL
     WHERE MANAGERID IS NULL
     UNION ALL
     SELECT A.EMPID,
            A.FULLNAME,
            A.MANAGERID,
            B.[ORGLEVEL] + 1
     FROM RECURSIVETBL A
          JOIN RECURSIVECTE B ON A.MANAGERID = B.EMPID)
SELECT *
FROM RECURSIVECTE;