Learn DATALOG with Real Code Examples

Ancestor computation using recursive rules

Detecting unreachable code in compilers

Computing user permissions in a policy system

Finding dependency cycles in graphs

Analyzing taint propagation in static analysis

Check predicate arity mismatches

Verify stratification when using negation

Ensure rule safety (variables must appear in positive literals)

Inspect evaluation order

Debug recursion with small datasets

Write small fact datasets to validate rules

Test recursive rules with minimal examples

Use rule-by-rule testing

Check derived relations for correctness

Automate evaluation with scripts

Standalone Datalog engine

Compiler analysis pipelines

Policy computation services

Graph reasoning microservices

Embedded Datalog in hosted systems

Soufflé Datalog

Flix language

Datomic Datalog

LogicBlox

RDF and reasoning engines (partial Datalog)

Databases (via facts -> tables)

Compilers and analysis tools

Authorization engines

Graph processing frameworks

Knowledge-based systems

Start with small fact datasets

Break recursion into base + step rules

Use stratified layers for negation

Test rules incrementally

Visualize predicate dependencies

Compute transitive closure efficiently

Model a role-based access control system

Perform pointer analysis using Datalog

Design a fact-based program dependency graph

Implement a dataflow analysis pipeline