Question

我有类型A的节点和类型B的节点我想匹配B的A和Y节点的X节点，并在所有那些A和所有那些B之间建立关系

到目前为止我是否尝试过（X = 2，Y = 2）：

MATCH (a:A) WITH a,rand() AS rand1 ORDER BY rand1 desc LIMIT 2
MATCH (b:B) WITH a,b,rand() AS rand2 ORDER BY rand2 desc LIMIT 2
CREATE (a)-[i:IN]->(b)
RETURN a,i,b

但是，每个选定的A和B只能创建1个连接例如：

a1-IN->b1  
a2-IN->b2

我希望能够创建所有排列：

a1-IN->b1  
a1-IN->b2
a2-IN->b1  
a2-IN->b2

有什么想法吗？

Answer 1

这个怎么样？

MATCH (a:A) WITH a, rand() AS rand ORDER BY rand LIMIT 2
WITH collect(a) AS as

MATCH (b:B) WITH b, rand() AS rand ORDER BY rand LIMIT 2
WITH as, collect(b) AS bs

UNWIND as AS a
UNWIND bs AS b

CREATE (a)-[i:IN]->(b)
RETURN a,i,b

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