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Dgraph DQL Tour

Var Blocks

GroupBy

A groupby query aggregates query results given a set of properties on which to group elements. For example, a query containing the block

director.film @groupby(genre) {
  a as count(uid)
}

finds nodes reachable along the director.film edge, partitions these into groups based on genre, then counts how many nodes are in each group.

Inside a groupby block, only aggregations are allowed and count can only be applied to uid.

The result is the grouped edges and the value variables for the aggregations.

In this case the value variable is a map from genres to values.

Often, it’s necessary to use groupby with another query to obtain values other than aggregations.

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
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Response

5.12 GroupBy