我错过了什么！ Timetree查询不能

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，但当合并为

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 

没有返回行！ 我错过了什么？

Answer 1

最后一个查询需要startPath和endPath以完全相同的ROOM节点结束（因为它们都使用相同的room标识符）。你的数据可能没有这样的节点。