我试图对这样的Notifications进行批处理,并得到一个带有单个通知事件的通知事件。有谁可以帮我?相关声明
INSERT INTO Notification SELECT d.id as id,a.stationId as stationId,d.firebaseToken as firebaseToken, d.position as devicePos,a.location as stationPos,a.levelNumber as levelNumber,a.levelName as levelName FROM AirQualityAlert.win:time(
我正在使用Esser EPL Online来更深入地了解CEP引擎Esper。现在,我正在努力定义一个EPL语句,如果一个事件发生在另一个事件之前,那么它就是真的。* from A.std:lastevent() as a, B.std:lastevent() as b where a.before(b); 每次我按下Submit时,都会出现以下错误: 请检查EPL