我需要将SQL代码转换为SAS代码。
NVL(SPRTELE_STATUS_IND, 'A') = 'A'
AND NVL(SPRTELE_PRIMARY_IND, 'Y') = 'Y'
AND NVL(SPRTELE_SEQNO, 99) =
(SELECT NVL(MAX(SPRTELE_SEQNO), 99)
FROM SATURN.SPRTELE D
WHERE SPRIDEN_PIDM = D.SPRTELE_PIDM
AND D.SPRTELE_TELE_CODE = 'MA'
AND NVL(D.SPRTELE_STATUS_IND, 'A') = 'A'
AND NVL(D.SPRTELE_PRIMARY_IND, 'Y') = 'Y'))
我该如何将NVL转换为SAS?这是什么意思。