SCHEMATA_LINKS view
The INFORMATION_SCHEMA.SCHEMATA_LINKS
view contains one row for each linked
dataset. A linked dataset links to a shared dataset in a project to which the
current user has access.
Required permission
To query the INFORMATION_SCHEMA.SCHEMATA_LINKS
view, you need the
bigquery.datasets.get
Identity and Access Management (IAM) permission at the project
level.
Each of the following predefined IAM roles includes the
permissions that you need in order to query the
INFORMATION_SCHEMA.SCHEMATA_LINKS
view:
roles/bigquery.admin
roles/bigquery.dataEditor
roles/bigquery.dataOwner
roles/bigquery.dataViewer
For more information about BigQuery permissions, see Access control with IAM.
Schema
The INFORMATION_SCHEMA.SCHEMATA_LINKS
view has the following schema:
Column name | Data type | Value |
---|---|---|
CATALOG_NAME
|
STRING
|
The name of the project that contains the source dataset. |
SCHEMA_NAME
|
STRING
|
The name of the source dataset. The dataset name is also referred to as
the datasetId .
|
LINKED_SCHEMA_CATALOG_NUMBER
|
STRING
|
The project number of the project that contains the linked dataset. |
LINKED_SCHEMA_CATALOG_NAME
|
STRING
|
The project name of the project that contains the linked dataset. |
LINKED_SCHEMA_NAME
|
STRING
|
The name of the linked dataset. The dataset name is also referred to as
the datasetId .
|
LINKED_SCHEMA_CREATION_TIME
|
TIMESTAMP
|
The time when the linked dataset was created. |
LINKED_SCHEMA_ORG_DISPLAY_NAME
|
STRING
|
The display name of the organization in which the linked dataset is created. |
Scope and syntax
Queries against this view must include a region qualifier. If you do not specify a regional qualifier, metadata is retrieved from the US region. The following table explains the region scope for this view:
View Name | Resource scope | Region scope |
---|---|---|
[PROJECT_ID.]INFORMATION_SCHEMA.SCHEMATA_LINKS |
Project level | US region |
[PROJECT_ID.]`region-REGION`.INFORMATION_SCHEMA.SCHEMATA_LINKS |
Project level | REGION |
- Optional:
PROJECT_ID
: the ID of your Google Cloud project. If not specified, the default project is used.
REGION
: any dataset region name. For example,`region-us`
.
Examples
This section lists examples to query the INFORMATION_SCHEMA.SCHEMATA_LINKS
view.
Example: List all linked datasets against another project
The following example lists all the linked datasets against another project
named otherproject
within the eu
region:
SELECT * FROM `otherproject`.`region-eu`.INFORMATION_SCHEMA.SCHEMATA_LINKS;
The output is similar to the following. Some columns are omitted to simplify the output.
+----------------+-------------+----------------------------+------------------------------+--------------------+--------------------------------+ | catalog_name | schema_name | linked_schema_catalog_name | linked_schema_catalog_number | linked_schema_name | linked_schema_org_display_name | +----------------+-------------+----------------------------+------------------------------+--------------------+--------------------------------+ | otherproject | myschema1 | subscriptionproject1 | 974999999291 | subscriptionld1 | subscriptionorg2 | | otherproject | myschema2 | subscriptionproject2 | 974999999292 | subscriptionld2 | subscriptionorg2 | | otherproject | myschema3 | subscriptionproject3 | 974999999293 | subscriptionld3 | subscriptionorg3 | +----------------+-------------+----------------------------+------------------------------+--------------------+--------------------------------+
Example: List all linked datasets by a shared dataset
The following example lists all the all the linked datasets by a shared dataset
named sharedataset
in the US
multi-region:
SELECT * FROM INFORMATION_SCHEMA.SCHEMATA_LINKS WHERE schema_name = 'sharedataset';
The output is similar to the following. Some columns are omitted to simplify the output.
+----------------+-------------+----------------------------+------------------------------+--------------------+--------------------------------+ | catalog_name | schema_name | linked_schema_catalog_name | linked_schema_catalog_number | linked_schema_name | linked_schema_org_display_name | +----------------+-------------+----------------------------+------------------------------+--------------------+--------------------------------+ | myproject | sharedataset| subscriptionproject1 | 674999999291 | subscriptionld1 | subscriptionorg1 | | myproject | sharedataset| subscriptionproject2 | 774999999292 | subscriptionld2 | subscriptionorg3 | +----------------+-------------+----------------------------+------------------------------+--------------------+--------------------------------+