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Dgraph DQL Tour

Var Blocks

Multiple Named Query Blocks

Note

From now on, to run the queries, you’ll need to have loaded the million triple movie dataset.

Queries can be issued as multiples.

For queries labeled q1, ..., qn issued as a multiple query block, the JSON result will contain labeled answer blocks q1, ..., qn for each query.

If a block is labeled with var, no results are returned for that query.

Queries issued in this way are independent.

The visualization here finds the union in the two queries based on uid, but the JSON result contains the independent answer for each query.

So, In this case, we are visualizing the union between two distinct queries.

Query variables are one of the most powerful features of DQL. Query variables allow the answers from one block to be used in another, joining the two queries. You’ll learn about query variables in the following pages.

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

5.1 Multiple Named Query Blocks