所以我有一个场景，我们有两个环境，一个是MSSQL，另一个是IBM Netezza，有点过时（ANSI-92）。我已经构建了MSSQL查询，但我不熟悉如何将MSSQL中的外部应用转换为符合ANSI-92的代码。
我知道使用较旧的环境基本上不赞成，但这是我无法控制的。谢谢你们给予的任何帮助。
以下是我要转换的部分：
Outer Apply
(select top 1 idclinicnumber, idorders
from orders where idClinicNumber = oGrandChild.idClinicNumber
and idpatient = oGrandChild.IdPatient
and IsGeneratedInError <> 1
and idordertype not in (14, 18)
and iddrugservice = pGrandChild.iddrugservice
and DateStartOrder > oGrandChild.datestartorder
and isNull(datestoporder, getdate()) >= DateStartOrder
and isnull(DateDC, GETDATE()) >= DateStartOrder order by DateStartOrder)
oFirstMedOrderAfterID
outer apply (select top 1 idclinicnumber, idservice, dateservice,
DoseDelivered from service where idclinicnumber =
oFirstMedOrderAfterOrder.idClinicNumber and idorders =
oFirstMedOrderAfterOrder.idorders and IdServiceStatus = 1 order by
DateService) oFirstService1AfterID
outer apply (select top 1 idclinicnumber, idservice, dateservice,
DoseDelivered from service where idclinicnumber =
oFirstMedOrderAfterOrder.idClinicNumber and idorders =
oFirstMedOrderAfterOrder.idorders and dateservice >
oFirstService1AfterID.DateService and IdServiceStatus = 1 order by
DateService) oFirstService2AfterID