You can delete nodes and relationships from a database using the DELETE clause.
Deleting All Nodes and Relationships
Following is the query to delete all the nodes and the relationships in the database the usage of the DELETE clause.
Query
MATCH (n) DETACH DELETE n
To execute the above query, carry out the following steps −
Step 1 − Open the Neo4j laptop App and begin the Neo4j Server. Open the built-in browser app of Neo4j the use of the URL http://localhost:7474/ as shown in the following screenshot.
Step 2 − Copy and paste the favored question within the dollar prompt and press the play button (to execute the question) highlighted within the following screenshot.
This will delete all the nodes and relationships from your neo4j database and make it empty.
Deleting a Particular Node
To delete a particular node, you want to specify the information of the node within the area of “n” inside the above question.
Syntax
Following is the syntax to delete a particular node from Neo4j the use of the DELETE clause.
MATCH (node:label {properties . . . . . . . . . . })
DETACH DELETE node
Example
Before intending with the example, create a node “Ishant” inside the Neo4j database as proven beneath.
CREATE (Ishant:player {name: "Ishant Sharma", YOB: 1988, POB: "Delhi"})
Following is a pattern Cypher Query which deletes the above created node using the DELETE clause.
MATCH (Ishant:player {name: "Ishant Sharma", YOB: 1988, POB: "Delhi"})
DETACH DELETE Ishant
To execute the above query, perform the following steps −
Step 1 − Open the Neo4j desktop App and begin the Neo4j Server. Open the built-in browser app of Neo4j the usage of the URL http://localhost:7474/ as shown in the following screenshot.
Step 2 − Copy and paste the favored question within the dollar set off and press the play button (to execute the question) highlighted inside the following screenshot.
Result
On executing, you may get the subsequent end result. Here you may observe that the desired node is deleted.