# API queries and Query Predicates

Learn how to use Query Predicates to retrieve data from the Composable Commerce APIs with the Java and TypeScript SDKs.

**Learning objectives**

After completing this module, you should be able to:

- Identify how to transfer specific requirements into Query Predicates.
- Identify correct usage of compound expressions and input variables in Query Predicates.
- Identify efficient and inefficient querying patterns in digital commerce scenarios.

**Agenda**

1. [Query Predicates](/learning-developer-essentials/api-queries-query-predicates/query-predicates.md)
2. [Queries and the SDKs](/learning-developer-essentials/api-queries-query-predicates/queries-and-the-sdks.md)
3. [Improve query performance](/learning-developer-essentials/api-queries-query-predicates/improve-query-performance.md)
4. [Learning check](/learning-developer-essentials/api-queries-query-predicates/learning-check.md)

**Prerequisites**

- [Introduction to Developer Essentials](/learning-developer-essentials/introduction-to-developer-essentials/overview.md) module
- [Manage resources with the SDK](/learning-developer-essentials/manage-resources-with-the-sdk/overview.md) module

**Audience**

- Functional or system architects
- Technical management
- Backend and frontend developers

## Related pages

- [Area overview page with navigation](/learning-developer-essentials.md)
- [Next page: Query Predicates](/learning-developer-essentials/api-queries-query-predicates/query-predicates.md)