---
metadata:
  - name: generator
    content: Diplodoc Platform v5.56.0
alternate:
  - https://ydb.tech/docs/en/dev/streaming-query/index.md?version=v26.2
  - https://ydb.tech/docs/ru/dev/streaming-query/index.md?version=v26.2
  - href: en/dev/streaming-query/index.md
    type: text/markdown
    title: Markdown version
  - href: ../../llms.txt
    type: text/markdown
    title: llms.txt
sourcePath: en/core/dev/streaming-query/index.md
---
> **Documentation Index:** Fetch the complete configuration index at https://ydb.tech/docs/en/llms.txt

# Streaming queries

Practical aspects of working with [streaming queries](https://ydb.tech/docs/en/concepts/glossary.md?version=v26.2#streaming-query):

- [Local and external topics](https://ydb.tech/docs/en/concepts/query_execution/topics.md?version=v26.2#local-external-topics) — accessing topics of the current and another database in YQL queries
- [Typical patterns](https://ydb.tech/docs/en/dev/streaming-query/patterns.md?version=v26.2) — minimal examples for a quick start
- [Writing to tables](https://ydb.tech/docs/en/dev/streaming-query/table-writing.md?version=v26.2) — how streaming queries allow writing data to YDB tables in real time.
- [Data enrichment](https://ydb.tech/docs/en/dev/streaming-query/enrichment.md?version=v26.2) — ways to enrich data in a stream using reference data.
- [Data formats for reading/writing topics](https://ydb.tech/docs/en/dev/streaming-query/streaming-query-formats.md?version=v26.2) — supported data formats when working with topics, examples of their use.
- [Data delivery guarantees](https://ydb.tech/docs/en/dev/streaming-query/guarantees.md?version=v26.2) — level of guarantees, observed anomalies in window aggregation, and recommendations.
- [Checkpoints](https://ydb.tech/docs/en/dev/streaming-query/checkpoints.md?version=v26.2) — a mechanism for saving the state of stream processing to ensure fault tolerance and recovery capability.

## See also

- [Recipes for working with streaming queries](https://ydb.tech/docs/en/recipes/streaming_queries/index.md?version=v26.2)
- [Streaming queries overview](https://ydb.tech/docs/en/concepts/streaming-query/streaming-query.md?version=v26.2)