我想减去从POSquantity到的值，iPay88quantity但出现错误
无效的列名
我的代码：
select distinct
tblCurrTrxIPAY88.strAmount as IPay88,
tblCurrTrxIPAY88.strPOSOnlineRefNo,
count(tblCurrTrxIPAY88.strPOSOnlineRefNo) as iPay88quantity,
b.strCostCentreID,
b.strPOSOnlineRefNo,
count(b.strPOSOnlineRefNo) as POSquantity,
strPayTypeCode, b.strRemarks as Agency,
tblMachine.strDesc As KioskName,
SUM(b.dblPaidAmt) as POS24,
SUM(b.dblPaidAmt) - tblCurrTrxIPAY88.strAmount as RMVarince,
POSquantity - iPay88quantity as Varince
from
tblCurrTrxMaster as b
inner join
tblMachine on b.strMachID = tblMachine.strMachID
inner join
tblCurrTrxIPAY88 on b.strPOSOnlineRefNo = tblCurrTrxIPAY88.strPOSOnlineRefNo
where
strPaymentMethod = '02'
and b.dtmCreated >= '1/23/2020'
and b.strTransStatus = '01'
group by
b.strCostCentreID , b.strPOSOnlineRefNo, b.strPayTypeCode, b.strRemarks,
tblMachine.strDesc, tblCurrTrxIPAY88.strAmount,
tblCurrTrxIPAY88.strPOSOnlineRefNo
iPay88Quantity不是表中的列名，它是一个计算字段-您需要对基础字段而不是计算字段进行数学运算，即：
POSquantity - count(tblCurrTrxIPAY88.strPOSOnlineRefNo) as Variance
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