QuestDB Online Compiler / SQL Runner
Write, test, and execute QuestDB SQL queries online directly from your browser with our free Online QuestDB Compiler / SQL Runner. Practice time-series queries, filtering, aggregation, timestamp-based analysis, and other supported QuestDB SQL operations without installing QuestDB locally or configuring Docker containers.
How to Use This QuestDB Compiler
- Write or paste your QuestDB SQL
Enter your query in the Code Editor. You can testSELECTstatements, filters, aggregations, table operations, timestamp-based queries, and other supported QuestDB SQL features. - Click the Run button
Select Run to execute your query. If the SQL contains a syntax or execution error, review the returned message, correct the relevant statement, and run it again. - Check the Output screen
Query results and execution messages appear in the Output panel. Use the available controls to copy, download, or delete the output before testing another query.
Key Features
- Free Online QuestDB SQL Runner: Execute QuestDB queries directly from a modern web browser.
- Zero Installation: No need to install QuestDB, configure Docker, or maintain a local database for supported exercises.
- Time-Series SQL Practice: Work with timestamped datasets, measurements, logs, sensor data, and event records.
- Instant Query Execution: Click Run and quickly review returned rows or query errors.
- Filtering & Aggregation: Practice
WHERE,GROUP BY, aggregate functions, ordering, and other supported SQL operations. - High-Performance Time-Series Queries: Test SQL logic designed for time-oriented datasets.
- Dark and Light Mode: Switch the Code Editor theme for comfortable database development.
- Output Controls: Copy, download, or clear query results directly from the Output panel.
1. How do I run a basic SELECT query in this online QuestDB compiler?
Use a standard SELECT statement to retrieve data.
To retrieve specific columns:
You can also filter and sort time-series records:
Enter the query in the Code Editor, click Run, and review the returned rows in the Output screen.
2. Is QuestDB a time-series database?
Yes. QuestDB is designed for time-series workloads, where records commonly contain timestamps and frequently arriving measurements or events.
For example, a simple sensor dataset could look like this:
You can then query recent measurements:
This type of structure is useful for IoT data, monitoring, telemetry, financial data, and application events.
3. Do I need to install Docker or QuestDB locally to use this tool?
No. You can use this Online QuestDB Compiler / SQL Runner directly from your browser for supported SQL exercises without installing QuestDB or starting a Docker container.
A local or hosted QuestDB environment may still be useful for persistent datasets, production ingestion, external application connections, large-scale benchmarks, server configuration, and advanced operational testing.
4. Does this compiler support standard SQL syntax for time-series data?
The editor supports QuestDB SQL syntax available in the configured environment, including familiar SQL patterns such as SELECT, WHERE, ordering, aggregation, and supported time-series operations.
A basic aggregation example:
For timestamp-based filtering, you can write queries such as:
This makes the online QuestDB editor useful for data engineers, IoT developers, backend developers, and students learning SQL for time-series databases.