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Dgraph DQL Tour

Var Blocks

Value variables: filtering and ordering

If the context provided by the UIDs of the block is correct, value variables can also be used in filtering and ordering.

Here, ID will be the UID’s of all directors of name Steven and average is a map from those UID’s to the average for each director. The filtering, ordering and result for var(average) are evaluated in that context to obtain each value.

A value variable can be used in place of a UID variable, uid(<value-variable>) evaluates to the UID’s in the map. For example, the avs query block could be written:

avs(func: uid(average), orderdesc: val(average)) @filter(ge(val(average), 40)) @normalize {

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

5.9 Value variables: filtering and ordering