我需要构建一个查询,可以计算平均值和计数值,同时忽略标准偏差中的异常值。MySQL忽略具有标准偏差的异常值
我在MySQL具有这些属性两个表(P和A):
P =付款:
Value_gbp
Paymentid
Account
rfx_ref
A =账户:
Accountid
Entity_type
Settlment_model
rfx_ref
到目前为止,我已经得到了此:
SELECT
Account,
COUNT(value_GBP) AS '# Of Payments',
TRUNCATE(AVG(value_GBP),2) As 'Avg Value'
FROM payments,
LEFT JOIN(
SELECT STDDEV(value_gbp) as std_gbp
FROM payments, accounts
WHERE payments.paymentid = accounts.acountid
AND Entity_type = 'company'
AND settlement_model = 'payment agent'
GROUP BY account
) outlier
On payments.paymentid = accounts.acountid
WHERE payments.value_gbp<=outlier.std_gbp*2
AND Entity_type = 'company'
AND settlement_model = 'payment agent'
GROUP BY account
但它正在下降,指出:
On payments.paymentid = accounts.acountid
任何人都可以帮助我吗?
“LEFT JOIN”前面不能有逗号 – Barmar
主查询无法访问子查询中的表。 – Barmar
在furure中,最好向我们展示实际的错误消息,而不是猜测出现错误的位置 – RiggsFolly