我错过了什么！ Timetree查询不起作用

Question

MATCH startPath = (event:RESERVATION)-[]->(sd:DAY)<-[:`5`]-(sm:MONTH)<-[:`1`]-(sy:YEAR)<-[:`2016`]-(room:ROOM)
WHERE event.reservationId = 44
RETURN startPath

和

MATCH endPath   = (event:RESERVATION)-[]->(ed:DAY)<-[:`6`]-(em:MONTH)<-[:`1`]-(ey:YEAR)<-[:`2016`]-(room:ROOM)
    WHERE event.reservationId = 44
    RETURN endPath

都返回有效路径，但组合为

时

MATCH startPath = (event:RESERVATION)-[]->(sd:DAY)<-[:`5`]-(sm:MONTH)<-[:`1`]-(sy:YEAR)<-[:`2016`]-(room:ROOM),
      endPath   = (event:RESERVATION)-[]->(ed:DAY)<-[:`6`]-(em:MONTH)<-[:`1`]-(ey:YEAR)<-[:`2016`]-(room:ROOM)
WHERE event.reservationId = 44
RETURN startPath, endPath

不返回任何行！ 我错过了什么？

Answer 1

最后一个查询要求startPath和endPath以相同的ROOM节点结束（因为它们都使用相同的room标识符）。您的数据可能没有这样的节点。