ClickHouse/docs/en/system_tables/system.columns.md

15 lines
628 B
Markdown
Raw Normal View History

# system.columns
Contains information about the columns in all tables.
You can use this table to get information similar to `DESCRIBE TABLE`, but for multiple tables at once.
```text
database String - Name of the database the table is located in.
table String - Table name.
name String - Column name.
type String - Column type.
default_type String - Expression type (DEFAULT, MATERIALIZED, ALIAS) for the default value, or an empty string if it is not defined.
default_expression String - Expression for the default value, or an empty string if it is not defined.
```