我目前正在研究一些sql的东西,但在某个问题上运行。SUM上的NULL值存在SQL问题
我有这种方法,寻找现金交易,并摘下现金返还,但有时没有现金交易,使价值变成了空值,你不能从NULL减去。 我试过在它周围放置一个ISNULL,但它仍然变为空。
任何人都可以帮助我吗?
;WITH tran_payment AS
(
SELECT 1 AS payment_method, NULL AS payment_amount, null as tran_header_cid
UNION ALL
SELECT 998 AS payment_method, 2 AS payment_amount, NULL as tran_header_cid
),
paytype AS
(
SELECT 1 AS mopid, 2 AS mopshort
),
tran_header AS
(
SELECT 1 AS cid
)
SELECT p.mopid AS mopid,
p.mopshort AS descript,
payment_value AS PaymentValue,
ISNULL(DeclaredValue, 0.00) AS DeclaredValue
from paytype p
LEFT OUTER JOIN (SELECT CASE
When (tp.payment_method = 1)
THEN
(ISNULL(SUM(tp.payment_amount), 0)
- (SELECT ISNULL(SUM(ABS(tp.payment_amount)), 0)
FROM tran_payment tp
INNER JOIN tran_header th on tp.tran_header_cid = th.cid
WHERE payment_method = 998
))
ELSE SUM(tp.payment_amount)
END as payment_value,
tp.payment_method,
0 as DeclaredValue
FROM tran_header th
LEFT OUTER JOIN tran_payment tp
ON tp.tran_header_cid = th.cid
GROUP BY payment_method) pmts
ON p.mopid = pmts.payment_method
你正在使用哪些DBMS? – 2011-05-12 09:12:51
你可能在你的ELSE子句中缺少一个ISNULL()吗? – 2011-05-12 09:18:02
@Daniel从ISNULL,我想这是MS SQL – bpgergo 2011-05-12 09:21:44