Information schema

The underlying query engine for the InfluxDB SQL implementation, DataFusion, provides commands that return metadata related to your data schema. To access this information, use the SHOW TABLES, SHOW COLUMNS, and SHOW ALL commands or query views in the ISO SQL information_schema schema.

In the context of InfluxDB, a measurement is represented as a table. Time, tags, and fields are each represented by columns in a table.

• SHOW TABLES
  • Example SHOW TABLES output
• SHOW COLUMNS
  • Example SHOW COLUMNS output
• SHOW ALL
  • Example SHOW ALL output

SHOW TABLES

Returns information about tables (measurements) in an InfluxDB bucket.

SHOW TABLES

You can also query the information_schema.tables view:

SELECT * FROM information_schema.tables

Example SHOW TABLES output

Measurements are those that use the iox table schema.

SHOW COLUMNS

Returns information about the schema of a table (measurement) in an InfluxDB bucket.

SHOW COLUMNS FROM example_table

You can also query the information_schema.columns view:

SELECT
  table_catalog,
  table_schema,
  table_name,
  column_name,
  data_type,
  is_nullable
FROM information_schema.columns
WHERE table_name = 'example_table'

Example SHOW COLUMNS output

SHOW ALL

Returns the configuration options of the current session.

SHOW ALL

You can also query the information_schema.df_settings view:

SELECT * FROM information_schema.df_settings