COLUMN_TAGS
Applies to: 
Databricks SQL Databricks Runtime 13.3 and above Unity Catalog only.
INFORMATION_SCHEMA.COLUMN_TAGS contains the column tagging metadata within the table, or all columns if owned by the SYSTEM catalog.
Information is displayed only for columns the user has permission to interact with.
This relation is an extension to the SQL Standard Information Schema.
Definition
The COLUMN_TAGS relation contains the following.
| Name | Data type | Nullable | Description |
|---|---|---|---|
CATALOG_NAME |
STRING |
No | The catalog name that a given tag applies to. |
SCHEMA_NAME |
STRING |
No | The schema that the tag applies to. |
TABLE_NAME |
STRING |
No | The table that the tag applies to. |
COLUMN_NAME |
STRING |
No | The column that the tag applies to. |
TAG_NAME |
STRING |
No | The name of the tag. |
TAG_VALUE |
STRING |
No | The value of the tag. |
Constraints
The following constraint applies to the COLUMN_TAGS relation:
| Class | Name | Column List | Description |
|---|---|---|---|
| Primary key | COLUMN_TAGS_PK |
CATALOG_NAME, SCHEMA_NAME, TABLE_NAME, COLUMN_NAME, TAG_NAME, TAG_VALUE |
Unique identifier for a column tag. |
| Foreign key | COLUMN_TAGS_COLUMNS_FK |
CATALOG_NAME, SCHEMA_NAME, TABLE_NAME, COLUMN_NAME |
References COLUMNS |
Example
> SELECT catalog_name, schema_name, table_name, column_name, tag_name, tag_value
FROM information_schema.column_tags;