Query data with InfluxQL
Use InfluxQL (an SQL-like query language) to interact with InfluxDB, and query and analyze your times series data.
In InfluxDB 1.x, data is stored in databases and retention policies. In InfluxDB OSS 2.7, data is stored in buckets. Because InfluxQL uses the 1.x data model, a bucket must be mapped to a database and retention policy (DBRP) before it can be queried using InfluxQL.
To query data with InfluxQL, complete the following steps:
- Verify buckets have a mapping.
- Create DBRP mappings for unmapped buckets.
- Query a mapped bucket with InfluxQL.
InfluxQL reference documentation
For complete InfluxQL reference documentation, see the InfluxQL specification for InfluxDB 2.x.
Verify buckets have a mapping
If you do not find a DBRP mapping for a bucket, create a new DBRP mapping to map the unmapped bucket.
Create DBRP mappings for unmapped buckets
- Use the
influxCLI or the InfluxDB API to manually create DBRP mappings for unmapped buckets. For examples, see Create DBRP mappings.
Query a mapped bucket with InfluxQL
If you haven’t already, do the following:
Use the following command to start an InfluxQL shell:
influx v1 shell
Execute an InfluxQL query inside the InfluxQL shell.
SELECT used_percent FROM example-db.example-rp.example-measurement WHERE host=host1
The InfluxDB 1.x compatibility API supports all InfluxDB 1.x client libraries and integrations in InfluxDB 2.7.
To query a mapped bucket with InfluxQL, use the
/query1.x compatibility endpoint, and include the following in your request:
- Request method:
- Authorization: See compatibility API authentication
- Query parameters:
db: 1.x database to query
rp: 1.x retention policy to query (if no retention policy is specified, InfluxDB uses the default retention policy for the specified database)
q: URL-encoded InfluxQL query
URL-encode query parameters that may contain whitespace or other special characters.
curl --get http://localhost:8086/query?db=example-db \ --header "Authorization: Token YourAuthToken" \ --data-urlencode "q=SELECT used_percent FROM example-db.example-rp.example-measurement WHERE host=host1"
By default, the
/querycompatibility endpoint returns results in JSON.
- Request method:
(Optional) To return results as CSV, include the
For more information about DBRP mappings, see Manage DBRP mappings.
InfluxDB OSS 2.x supports the following InfluxQL statements and clauses. See supported and unsupported queries below.
Supported InfluxQL queries
SHOW TAG KEYS
SHOW FIELD KEYS
SHOW SERIES EXACT CARDINALITY
SHOW TAG KEY CARDINALITY
SHOW FIELD KEY CARDINALITY
* These commands delete data.
Unsupported InfluxQL queries
SHOW SERIES CARDINALITY
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