docs: Add ref for range query #618
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waynexia
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Oct 12, 2023
nicecui
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Oct 13, 2023
| Querying and aggregating data within a range of time is a common query pattern for time series data, such as the `Range selector` in `PromQL`. GreptimeDB supports Range queries in SQL, which is used to summarize time series data into time chunks and aggregate data on time chunks. As part of the `SELECT` statement, Range query can be flexibly combined with SQL to provide more powerful time series data query capabilities in SQL. | ||
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| ## Syntax | ||
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The syntax should be something like (just an example):
SELECT
RANGE_EXPRESSION(column1) RANGE TIME_INTERVAL,
....
FROM table_name
TIME_DURATION BY(column2) FILLING_METHODThen explain every concepts in the syntax:
- RANGE_EXPRESSION
- RANGE keyword
- TIME_INTERVAL
.....
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Can you add a link to this document from the |
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done @nicecui |
xtang
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Oct 18, 2023
beryl678
approved these changes
Oct 18, 2023
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What's Changed in this PR
Add reference for range query in v0.4
related issue
GreptimeTeam/greptimedb#1662
Wait this GreptimeTeam/greptimedb#2557 merge to greptimedb first
Checklist
summary.ymlmatches the current document structure when you changed the document structure.