您能否让我知道如何将以下sql服务器代码转换为Snowflake，因为Snowflake不会 支持相关子查询。
SELECT DISTINCT
CURRENT_DATE as creationdate, LastName,
(SELECT Date AS Exp1
FROM PSU AS P
WHERE (HQL = a.B1L) AND (HQH = a.B1H) AND
(HQN =
(SELECT MAX(HQN) AS Exp1
FROM PSU AS P2
WHERE (HQL = a.B1L) AND (HQH = a.B1H) AND (HQZ = 'P') AND (HQF = 'P'))))AS "paymentDATE",
(CASE WHEN (SELECT MAX(H6P)
FROM sss
WHERE H6P = B1L AND H6CPS NOT IN ('H', 'C')) IS NULL THEN 'N' ELSE 'Y' END) AS "ORDER(Y/N)"
FROM ACT AS a INNER JOIN
CU AS c ON c.BSL = a.B1L INNER JOIN
CS AS cs ON cs.B2L = a.B1L AND a.B1H = cs.B2H
WHERE (a.B1M <> 0) AND (cs.B2K IN ('H'))
我为上述代码创建的雪花代码，但尚未为“ ORDER（Y / N）”字段创建CTE：我觉得CTE中的联接不正确，并且不确定如何将CTE联接到main查询
WITH RECURSIVE PaymentDate AS
(SELECT MAX(HQN) AS Expr1
FROM PSU AS P2
JOIN POP AS a ON (P2.HQL = a.B1L) AND (P2.HQH= a.B1H) AND (P2.HQZ = 'P') AND (P2.HQF= 'P')
)
, LPD AS
(SELECT Date as Exp1 FROM
PSU AS P
JOIN ACT AS A ON (P.HQL = a.B1L) AND (P.HQH = a.B1H)
JOIN TNR ON (P.HQN =TNR.Expr1)
)
SELECT DISTINCT CURRENT_DATE as creationdate, LastName
(CASE WHEN (SELECT MAX(H6P) FROM sss WHERE H6P = B1L AND H6CPS NOT IN ('H', 'C'))
IS NULL THEN 'N' ELSE 'Y' END) AS "ORDER(Y/N)"
FROM ACT AS a INNER JOIN
CU AS c ON c.BSL = a.B1L
INNER JOIN CS AS cs ON cs.B2L = a.B1L AND a.B1H = cs.B2H
WHERE (a.B1M <> 0) AND (cs.B2K IN ('H'))
答案 0 :(得分：0)
如果您将两个子查询都重写为应该工作的CTE。
第一个CTE获得以下值： HQL，HQH，MAX（HQN）
第二个CTE将PSU加入第一个CTE以获得“ paymentDATE”
将第二个CTE加入您的主要查询