Question

如果我有csv如下：

"route_id","service_id","trip_id","trip_headsign"
4973_3, 2, 14519396, "Bf. Tostedt"
4973_3, 2, 14519395, "Bf. Tostedt"
4973_3, 1, 14519379, "Sittensen, Schule"
4973_3, 1, 14519391, "Sittensen, Bahnhofstraße"
4973_3, 2, 14519394, "Bf. Tostedt"
4973_3, 1, 14519390, "Bf. Tostedt"
4973_3, 3, 14519381, "Bf. Tostedt"
4973_3, 4, 14519392, "Bf. Tostedt"

我只想在trip_headsign 唯一时加载，所以在上面的情况下我只会创建3次旅行。我该怎么做？

我到目前为止：

load csv with headers from  
 'file:///hamburg/trips.txt' as csv   
 create (t:Trip {id: csv.trip_id, service_id: csv.service_id, headsign: csv.trip_headsign});

但是我收到了这个错误：

Node(76020) already exists with label `Trip` and property `headsign` = 'Bf. Tostedt'

我故意将keign标记为唯一约束，因为我只希望它的每个人只存在一次。

Answer 1

我现在想通了。感谢

load csv with headers from  
'file:///hamburg/trips.txt' as csv   
merge (t:Trip {headsign: csv.trip_headsign})
on match set t.id =  csv.trip_id
on match set t.service_id = csv.service_id

Neo4j仅在唯一时加载CSV

1 个答案: