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Information schema

The information schema consists of a set of views that contain information about the objects defined in the current database.

Tables

The information_schema.tables view contains all tables, views, sinks, and materialized views defined in the current database.

note

Materialized views are specific to the information schema of RisingWave. They are not included in the information schema of PostgreSQL.

The information_schema.tables view contains the following columns.

ColumnTypeDescription
table_catalogvarcharName of the current database
table_schemavarcharName of the schema that contains the table, view, or materialized view. The default schema for user-created objects is public.
table_namevarcharName of the table, view, or materialized view
table_typevarcharType of the table, view, or materialized view. BASE TABLE for a user-defined table, VIEW for a non-materialized view, MATERIALIZED VIEW for a materialized view, and SYSTEM TABLE for a system table.
is_insertable_intovarcharYES if the table or view is insertable into, NO if not. User-defined tables are always insertable, while views and materialized views are not necessarily.

Views

The information_schema.views view contains information about the views in the database.

It contains the following columns.

ColumnTypeDescription
table_catalogvarcharName of the current database
table_schemavarcharName of the schema that contains the view
table_namevarcharName of the view
view_definitionvarcharSQL statement that defines the view
Temporary Limitation

Users with access to information_schema.views can potentially access all views, which poses a security risk. We are working to resolve this limitation. Once the fix is implemented, this message will be removed.

Columns

The information_schema.columns view contains information about columns of all tables, views, and materialized views in the database.

ColumnTypeDescription
table_catalogvarcharName of the current database.
table_schemavarcharName of the schema that contains the table, sink, view, or materialized view. The default schema for user-created objects is public.
table_namevarcharName of the table, sink, view, or materialized view
column_namevarcharName of the column
ordinal_positionint32Ordinal position of the column within the table (count starts at 1)
is_nullablevarcharYES if the column is possibly nullable; NO if it is known not nullable.
data_typevarcharData type of the column

How to use the information schema views?

You can use various information schema views to determine the makeup of tables, sinks, views, and materialized views in a database.

For example, you can query for names and types of all the tables, views, and materialized views in the current database:

SELECT table_name, table_type
FROM information_schema.tables;

To query for all of the columns in a table, sink, view, or materialized view called taxi_trip:

SELECT column_name
FROM information_schema.columns
WHERE table_name='taxi_trip';

To find out tables, sinks, views, and materialized views that contain a column called trip_id:

SELECT table_name
FROM information_schema.columns
WHERE column_name='trip_id';
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