In a microservices architecture, services work independently with their own databases and communicate using messaging. However, querying data across multiple services can be a challenge. One solution is the API Composition pattern, which combines data from different services. Another option is using Command Query Responsibility Segregation (CQRS), which create a read-only datastore that syncs data from multiple services. Although CQRS can be more complex to implement, it offers benefits such as efficient query implementation and improved separation of concerns. Finally, real-time querying can be achieved using Apache Kafka, an open-source distributed streaming platform.
