Import data

- [Instructor] This is the graph data model…that we'll use when we import our road safety data.…Now let's use Load CSV to import this data…building up our graph model.…These nodes represent the data…from three separate CSV files,…so we'll need to write one Load CSV statement for each file.…Let's switch back to Neo4j browser.…Now we said that the Accident Index property…is a key that uniquely identifies the accident.…This means that we'll want to create a uniqueness constraint…on the accident label asserting…that the Accident Index property is unique.…

Now, let's create our accident nodes.…We'll use Periodic Commit to speed…the performance of our imports,…displaying our import across multiple transactions.…We'll use Load CSV With Headers…specifying the Accidents_2015.csv file.…We'll alias that value to row,…and since we have the uniqueness constraint on accident,…we can use the Merge command to avoid creating duplicates.…

So we'll merge on the accidentIndex property,…and in the case where we create a new accident,…