neo4j，唯一性约束创建

示例 - Cypher Manual (neo4j.com)

 

创建节点唯一性约束

CREATE CONSTRAINT ON (<label_name>)
ASSERT <property_name> IS UNIQUE

　若设置agent的hash属性唯一性约束

CREATE CONSTRAINT ON (a:label) ASSERT a.hash IS UNIQUE 

CREATE CONSTRAINT book_isbn IF NOT EXISTS  FOR (book:Book) REQUIRE book.isbn IS UNIQUE

　　关系属性唯一性约束

CREATE CONSTRAINT edge1
FOR ()-[r:Used]-() REQUIRE r.hash IS UNIQUE

　　

查看所有约束

SHOW CONSTRAINTS

　　删除约束

DROP CONSTRAINT  name