12.1. Start

12.1.1. Node by id
12.1.2. Relationship by id
12.1.3. Multiple nodes by id
12.1.4. All nodes
12.1.5. Node by index lookup
12.1.6. Relationship by index lookup
12.1.7. Node by index query
12.1.8. Multiple starting points

Every query describes a pattern, and in that pattern one can have multiple starting points. A starting point is a relationship or a node where a pattern is anchored. You can either introduce starting points by id, or by index lookups. Note that trying to use an index that doesn’t exist will throw an exception.

Figure 12.1. Graph


12.1.1. Node by id

Binding a node as a starting point is done with the node(*) function.

[Note]Note

Neo4j reuses its internal ids when nodes and relationships are deleted, which means it’s bad practice to refer to them this way. Instead, use application generated ids.

Query. 

START n=node(1)
RETURN n

The corresponding node is returned.

Result

n
1 row

Node[1]{name:"A"}


Try this query live. (1) {"name":"A"} (2) {"name":"B"} (3) {"name":"C"} (1)-[:KNOWS]->(2) {} (1)-[:KNOWS]->(3) {} start n=node(1) return n

12.1.2. Relationship by id

Binding a relationship as a starting point is done with the relationship(*) function, which can also be abbreviated rel(*). See Section 12.1.1, “Node by id” for more information on Neo4j ids.

Query. 

START r=relationship(0)
RETURN r

The relationship with id 0 is returned.

Result

r
1 row

:KNOWS[0] {}


Try this query live. (1) {"name":"A"} (2) {"name":"B"} (3) {"name":"C"} (1)-[:KNOWS]->(2) {} (1)-[:KNOWS]->(3) {} start r=relationship(0) return r

12.1.3. Multiple nodes by id

Multiple nodes are selected by listing them separated by commas.

Query. 

START n=node(1, 2, 3)
RETURN n

This returns the nodes listed in the START statement.

Result

n
3 rows

Node[1]{name:"A"}

Node[2]{name:"B"}

Node[3]{name:"C"}


Try this query live. (1) {"name":"A"} (2) {"name":"B"} (3) {"name":"C"} (1)-[:KNOWS]->(2) {} (1)-[:KNOWS]->(3) {} start n=node(1, 2, 3) return n

12.1.4. All nodes

To get all the nodes, use an asterisk. This can be done with relationships as well.

Query. 

START n=node(*)
RETURN n

This query returns all the nodes in the graph.

Result

n
3 rows

Node[1]{name:"A"}

Node[2]{name:"B"}

Node[3]{name:"C"}


Try this query live. (1) {"name":"A"} (2) {"name":"B"} (3) {"name":"C"} (1)-[:KNOWS]->(2) {} (1)-[:KNOWS]->(3) {} start n=node(*) return n

12.1.5. Node by index lookup

When the starting point can be found by using index lookups, it can be done like this: node:index-name(key = "value"). In this example, there exists a node index named nodes.

Query. 

START n=node:nodes(name = "A")
RETURN n

The query returns the node indexed with the name "A".

Result

n
1 row

Node[1]{name:"A"}


12.1.6. Relationship by index lookup

When the starting point can be found by using index lookups, it can be done like this: relationship:index-name(key = "value").

Query. 

START r=relationship:rels(name = "Andrés")
RETURN r

The relationship indexed with the name property set to "Andrés" is returned by the query.

Result

r
1 row

:KNOWS[0] {name:"Andrés"


12.1.7. Node by index query

When the starting point can be found by more complex Lucene queries, this is the syntax to use: node:index-name("query").This allows you to write more advanced index queries.

Query. 

START n=node:nodes("name:A")
RETURN n

The node indexed with name "A" is returned by the query.

Result

n
1 row

Node[1]{name:"A"}


12.1.8. Multiple starting points

Sometimes you want to bind multiple starting points. Just list them separated by commas.

Query. 

START a=node(1), b=node(2)
RETURN a,b

Both the nodes A and the B are returned.

Result

ab
1 row

Node[1]{name:"A"}

Node[2]{name:"B"}


Try this query live. (1) {"name":"A"} (2) {"name":"B"} (3) {"name":"C"} (1)-[:KNOWS]->(2) {} (1)-[:KNOWS]->(3) {} start a=node(1), b=node(2) return a,b