Neo4j能否在合并语句后添加WHERE子句？

下面我有一个功能性的CQL查询，它返回3种节点类型和2种关系

LOAD CSV WITH HEADERS FROM ("file:///sessions/parsed_message_amp_v2.csv") AS row
MERGE (a:Sender { name: row.From}) 
MERGE (b:Url_Sub_Fld { name: row.Url_Sub_Fld})
MERGE (c:Recipient { name: row.To})
WITH a,b,c,row
CALL apoc.merge.relationship(a, row.Outcome, {}, {}, b) YIELD rel as rel1 
CALL apoc.merge.relationship(b, row.Outcome2, {}, {}, c) YIELD rel as rel2
RETURN a,b,c

我想添加一个where子句，该子句只对b.Url\u Sub\u Fld是字符串

false

的节点进行图形化。当然，下面的例子失败了。你怎么做这样的事

LOAD CSV WITH HEADERS FROM ("file:///sessions/parsed_message_amp_v2.csv") AS row
MERGE (a:Sender { name: row.From}) 
MERGE (b:Url_Sub_Fld { name: row.Url_Sub_Fld})
MERGE (c:Recipient { name: row.To})
WHERE b.Url_Sub_Fld = "false" 
WITH a,b,c,row
CALL apoc.merge.relationship(a, row.Outcome, {}, {}, b) YIELD rel as rel1 
CALL apoc.merge.relationship(b, row.Outcome2, {}, {}, c) YIELD rel as rel2
RETURN a,b,c

---

如果您希望在此时筛选结果，请使用WITH，后跟WHERE。听起来您只想过滤返回的内容，所以在通话之后和返回之前应用：

LOAD CSV WITH HEADERS FROM ("file:///sessions/parsed_message_amp_v2.csv") AS row
MERGE (a:Sender { name: row.From}) 
MERGE (b:Url_Sub_Fld { name: row.Url_Sub_Fld})
MERGE (c:Recipient { name: row.To})
WITH a,b,c,row
CALL apoc.merge.relationship(a, row.Outcome, {}, {}, b) YIELD rel as rel1 
CALL apoc.merge.relationship(b, row.Outcome2, {}, {}, c) YIELD rel as rel2
WITH a,b,c,row
WHERE b.Url_Sub_Fld = "false" 
RETURN a,b,c

---

这种

WHERE

子句的语义应该是什么<代码>合并通常的工作方式是，如果它不能匹配您定义的内容，它将创建新节点-这就是您想要的吗？如果是这样，您可以将其添加到MERGE子句：

MERGE（b:Url\u Sub\u Fld{name:row.Url\u Sub\u Fld，另一个属性：“false”}）

，这是有意义的。如果我想获取不包含“false”的其他数据，我可以在MERGE语句中定义它吗？使用一个常规的MATCH子句。对其应用的位置做了一个小更改，因为我刚刚意识到您似乎只想筛选返回的结果，但仍然应用所有操作（您的合并关系调用）为了所有的结果。再次感谢你，有很多东西要学。。。当使用MERGE@InverseFalcon时，在