A：有，周期设置为cy_halfs()即半秒线函数。
语句如：setsysparam(pn_cycle(),cy_halfs());

//提取案例：取沪深300期货主力合约在2019-12-23日的半秒线行情数据
setsysparam(pn_cycle(),cy_halfs());
return select ['StockID'],FormatDateTime('yyyy-mm-dd hh:nn:ss:zzz',['date']) as 'date',
['close'],['vol'],['cjbs'],['buy1'],['sale1']
from markettable
datekey 20191223T to 20191223.15T of 'IF00' end;
//返回结果如下：