看似简单的Neo4j密码查询无法执行

数据模型是：

> (A:word {word:'word'})-[:NEXT sentence:<s-order> word:<w-order>]->(B:word)
> (S:Sentence)-[:START]->(A:word)

问：为什么这个查询失败了

我想到的可能答案是：

这可能与围绕word18循环创建关系有关。如您所见，它在查询中使用了两次，创建了两个传入和两个传出，它们彼此不同：

• 29->18->30
• 32->18->33

我怎样才能防止这种情况

---

Neo4j版本是3.0.6 CE。

是！找到答案。。。数据集减少到40个节点。这仍然让查询中断。（数据集中有31个节点有关系，9个没有关系）
经过多次跟踪查询后，发现以下工作查询：

MATCH (word8:word {word:'de'}),
(word24:word {word:'platen'}),
(word25:word {word:'halen'}),
(word26:word {word:'alles'}),
(word27:word {word:'wel'}),
(word28:word {word:'weer'}),
(word29:word {word:'voor'}),
(word18:word {word:'je'}),
(word30:word {word:'naar'}),
(word31:word {word:'boven'}),
(word32:word {word:'als'}),
(word33:word {word:'ze'}),
(word3353:word {word:'afspeelt'}), 
(PrevSentence:Sentence {order:2}) 
MERGE (PrevSentence)-[:NEXT]->
  (ThisSentence:Sentence {order:3})-[:START]->(word8)
MERGE (word8)-[nw26:NEXT {sentence:3, word:0}]->(word24)
MERGE (word24)-[nw27:NEXT {sentence:3, word:1}]->(word25)
MERGE (word25)-[nw28:NEXT {sentence:3, word:2}]->(word26)
MERGE (word26)-[nw29:NEXT {sentence:3, word:3}]->(word27)
MERGE (word27)-[nw30:NEXT {sentence:3, word:4}]->(word28)
MERGE (word28)-[nw31:NEXT {sentence:3, word:5}]->(word29)
MERGE (word29)-[nw32:NEXT {sentence:3, word:6}]->(word18)
MERGE (word18)-[nw33:NEXT {sentence:3, word:7}]->(word30)
MERGE (word30)-[nw34:NEXT {sentence:3, word:8}]->(word31)
MERGE (word31)-[nw35:NEXT {sentence:3, word:9}]->(word32)
MERGE (word32)-[nw36:NEXT {sentence:3, word:10}]->(word18)
MERGE (word18)-[nw37:NEXT {sentence:3, word:11}]->(word33)
MERGE (word33)-[nw38:NEXT {sentence:3, word:12}]->(word3353) 

正如你所看到的，它涉及到将整个关系链分解到原子级。在这种情况下，Neo4j在加工零件方面没有任何问题

---

虽然找到了答案，但我仍然很好奇为什么Neo4j不能处理这个查询。节点链太长？查询处理中的“辅助”数据太多？

是否尝试将单词的条件从

WHERE

子句移动到

MATCH

子句？例如

匹配（word0:word{word:'albums'}），…

。就性能而言，它应该不会有什么不同（但这一点值得使用

配置文件
进行检查）。另外，我认为它提高了可读性。谢谢Gábor！我已经完全删除了where子句。这要整洁得多。但是，我仍然无法运行某些查询。在第二个匹配中，您没有将
PrevSession
绑定到任何特定类型（例如
：Session
），只对
顺序进行筛选。在大型图形上进行计算可能很慢。另一个小建议是：在第一个
匹配
之后的
WITH
子句是不必要的。我只创建了查询所需的节点，在一个空数据库上运行良好。你能在一个空数据库上做实验吗？也许继续？谢谢@GáborSzárnyas引导我找到答案：-）
MATCH (word8:word {word:'de'}),
(word24:word {word:'platen'}),
(word25:word {word:'halen'}),
(word26:word {word:'alles'}),
(word27:word {word:'wel'}),
(word28:word {word:'weer'}),
(word29:word {word:'voor'}),
(word18:word {word:'je'}),
(word30:word {word:'naar'}),
(word31:word {word:'boven'}),
(word32:word {word:'als'}),
(word33:word {word:'ze'}),
(word3353:word {word:'afspeelt'}), 
(PrevSentence:Sentence {order:2}) 
MERGE (PrevSentence)-[:NEXT]->
  (ThisSentence:Sentence {order:3})-[:START]->(word8)
MERGE (word8)-[nw26:NEXT {sentence:3, word:0}]->(word24)
MERGE (word24)-[nw27:NEXT {sentence:3, word:1}]->(word25)
MERGE (word25)-[nw28:NEXT {sentence:3, word:2}]->(word26)
MERGE (word26)-[nw29:NEXT {sentence:3, word:3}]->(word27)
MERGE (word27)-[nw30:NEXT {sentence:3, word:4}]->(word28)
MERGE (word28)-[nw31:NEXT {sentence:3, word:5}]->(word29)
MERGE (word29)-[nw32:NEXT {sentence:3, word:6}]->(word18)
MERGE (word18)-[nw33:NEXT {sentence:3, word:7}]->(word30)
MERGE (word30)-[nw34:NEXT {sentence:3, word:8}]->(word31)
MERGE (word31)-[nw35:NEXT {sentence:3, word:9}]->(word32)
MERGE (word32)-[nw36:NEXT {sentence:3, word:10}]->(word18)
MERGE (word18)-[nw37:NEXT {sentence:3, word:11}]->(word33)
MERGE (word33)-[nw38:NEXT {sentence:3, word:12}]->(word3353)