范例1:取一个完整交易日的交易明细数据
endt:=20190521T;
Return Select * from TradeTable DateKey endt-1+18/24 to endt+18/24 Of "SZ000002" end;
范例2:取一段时间多个股票的交易明细
return select ['StockID'],['StockName'],datetimetostr(['Date']) as 'Date',
['price'],['vol'],['amount'] from tradetable datekey 20190520.1030T to 20190521.14T
of array("SZ000002","SH600000") where ['price']>0 end;