===== Beyond the Semantic Web =====

  * Last verification: **20230111**
  * Tools required for this lab:
    * [[https://sandbox.neo4j.com/|Neo4j Sandbox]] (for playing with Cypher)
    * [[https://countries.trevorblades.com/|The Countries playground]] (for playing with GraphQL)

==== Prepare yourself for the lab ====

  * //Beyond the Semantic Web// lecture -- part about Cypher and GraphQL (slides are [[start#lectures|on the main page]])

==== Lab instructions ====

=== 1. Introduction to Cypher [45 minutes] ===

  * We will explore the Movie Graph! with the Neo4j tools. First of all, follow one of the following links to create your own Movie Graph instance (there is a need to create an account):​
    * https://sandbox.neo4j.com/ (3-10 days projects)
    * https://console.neo4j.io/ (1 small graph for free)
  * If you are using sandbox, the Movie Graph is already loaded.
    * If you are starting with blank project, first load the Movie Graph by putting '':play movie-graph'' in the neo4j console
  * Then explore the graph by creating the following queries in Cypher. If you need some help, take a look at the [[https://neo4j.com/developer/cypher/|documentation]].
  - Select any 5 nodes​
  - Select any 5 relations​
  - Select subject, predicate and object for 5 triples​
  - Find one Person​
  - Find Person named 'Tom Hanks' 
  - Find movies in which Tom Hanks acted​
  - Find co-actors of Tom Hanks​
  - Find the path between the Tom Hanks and Meg Ryan​
  - Find title and release date of movies in which Tom Hanks acted (see Q6)​
  - Sort the movies (from Q9) by release date (descending order)​
  - Select only movies released in the 1990s (from Q10)​
  - Count these movies (from Q11)!

=== 2. Introduction to GraphQL [35 minutes] ===

  * Play with the Countries dataset in [[https://countries.trevorblades.com/|the playground]] using GraphQL
  - First of all, run the default query (loaded when the playground starts)
    * Do you understand it?
    * Do you know how to get the data about Germany instead of Poland?
    * If you need some help, use the docs: [[https://graphql.org/learn/|Introduction to GraphQL]], [[https://graphql.org/learn/queries/|Queries and Mutations]]
  - But wait, how do one find out which fields are available in the dataset?
    * Use the [[https://graphql.org/learn/introspection/|Introspection]] to query the schema to get the information about possible values for Country class!

=== 3. The Graph of Thrones [any time] ===

  * If you want to get to know the Cypher language better, check out [[https://github.com/mneedham/neo4j-got|this tutorial]], which introduces a lot more elements of the language using the Game of Thrones graph as an example!
    * To start the tutorial, simply enter ''<nowiki>:play https://guides.neo4j.com/got_wwc</nowiki>'' in neo4j console

==== Learn more! ====

=== Cypher ===
  * Docs:
    * [[https://neo4j.com/developer/cypher/|Cypher documentation]]
    * [[https://neo4j.com/docs/cypher-cheat-sheet/current/|Cypher cheat-sheet]]
  * Tutorials:
    * [[https://github.com/mneedham/neo4j-got|neo4j-got]] -- to start it, enter ''<nowiki>:play https://guides.neo4j.com/got_wwc</nowiki>'' in neo4j console
    * [[https://www.lyonwj.com/blog/graph-of-thrones-neo4j-social-network-analysis|Analyzing the Graph of Thrones]] -- to start it, enter ''<nowiki>:play https://guides.neo4j.com/got</nowiki>'' in neo4j console

=== GraphQL ===
  * [[https://graphql.org/learn/|GraphQL Tutorial]]