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Dgraph DQL Tour

Var Blocks

Query Variables in another query block I

Let’s take a second to think about that last query. The variable JC_actor evaluated to all actors in any Jane Campion film. No matter where we use it, it’s the full set.

That’s the key to using Dgraph’s variables correctly: understand that they are global in the sense that they evaluate to all nodes that could match that edge in the query, not local in the sense that would evaluate to different results for each Jane Campion film.

We can also use query variables in another query block, both as the nodes the root filter matches and in internal filters.

Peter Jackson often appears in his own films, mostly in the background or just a glimpse, but he’s there. The query shows all films that Peter Jackson has both directed and appeared in.

Dgraph DQL Tour

An interactive tutorial with real queries and real results, designed to run on Chrome on your machine.

Modules

. GraphQL Introduction . GraphQL Basic Features . GraphQL Schema . GraphQL Search . GraphQL Data and More Data . DQL Introduction . DQL Basic Features . DQL Schema . DQL Data and More Data . DQL Query Blocks and Variables . DQL Search

DQL Query Blocks and Variables

This module shows you how to build more powerful queries with multiple query blocks and query variables.

Module Breakdown

5.1. Multiple Named Query Blocks 5.2. Query Variables 5.3. Query Variables in a child block 5.4. Query Variables in another query block I 5.5. Query Variables in another query block II 5.6. Exercise: Query Variables linking queries 5.7. Value variables - min and max 5.8. Exercise : Value variables - sum and avg 5.9. Value variables: filtering and ordering 5.10. Value variables: math functions 5.11. Exercise : Latest Movies 5.12. GroupBy 5.13. Congratulations!
Endpoint: /query
Dgraph: http://localhost:8080
Reset Run
Response

5.4 Query Variables in another query block I