# 30.39. view_column_usage

## 30.39. `view_column_usage`

The view `view_column_usage` identifies all columns that are used in the query expression of a view (the `SELECT` statement that defines the view). A column is only included if the current user is the owner of the table that contains the column.

### Note

Columns of system tables are not included. This should be fixed sometime.

Table 30.37. `view_column_usage` Columns

Name | Data Type | Description
--- | --- | ---
`view_catalog` | `sql_identifier` | Name of the database that contains the view (always the current database)
`view_schema` | `sql_identifier` | Name of the schema that contains the view
`view_name` | `sql_identifier` | Name of the view
`table_catalog` | `sql_identifier` | Name of the database that contains the table that contains the column that is used by the view (always the current database)
`table_schema` | `sql_identifier` | Name of the schema that contains the table that contains the column that is used by the view
`table_name` | `sql_identifier` | Name of the table that contains the column that is used by the view
`column_name` | `sql_identifier` | Name of the column that is used by the view