- [Instructor] We've designed our graph data model…and imported our data,…so now it's time to write the Cypher query…that will find all accidents that involved a motorcycle…and compute the average severity of the accident…for each distinct type of motorcycle.…First, let's verify that our import was correct…by inspecting the graph data model using db.schema,…and we can see this matches the data model…that we defined earlier,…we have an accident that involves a vehicle…where that vehicle is type of, vehicle type.…
So now let's start writing our query.…We'll start by finding all the vehicle type nodes…that contain the word motorcycle.…We do this by writing a match statement.…Now match takes a graph pattern,…and the pattern here is pretty simple.…In this case, we want a match on nodes…with the label vehicle type,…we'll use a where clause to define a predicate…where the name property on vehicle type…contains the word motorcycle,…contain is the string-matching operator…that will allow us to search for substring matches…
Author
Released
9/19/2017- Strengths and weaknesses of Neo4j
- Data modeling
- Creating a database
- Joining data sets
- Modeling data for joining data sets
- Searching a database
- CRUD operations
- Performing calculations
Skill Level Intermediate
Duration
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Introduction
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Welcome1m 17s
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The Database Clinic series1m 22s
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1. Neo4j in Five Minutes
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A brief overview of Neo4j3m 23s
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2. Create a Database
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Data modeling3m 52s
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Creating a database3m 56s
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Import data10m 27s
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Query data3m 12s
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3. Join Two Datasets
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Join datasets2m 50s
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Import data6m 26s
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4. Search a Database
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Database search1m 51s
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Query the database5m 22s
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Finalize the database query3m 34s
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5. Create, Read, Update, and Delete Operations
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CRUD operations2m 31s
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Create operations in Neo4j8m 36s
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Update operations in Neo4j8m 11s
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Delete operations in Neo4j3m 44s
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Read operations in Neo4j3m 43s
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6. Averages and Calculations
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Calculations1m 59s
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Update the data model3m 36s
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Refactor the data model10m 22s
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Import data for calculations5m 52s
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Perform calculations7m 55s
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Conclusion
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Next steps1m 44s
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Video: Compute average accident severity