CREATE EXTERNAL TABLE

Syntax

CREATE EXTERNAL TABLE name
SETTINGS type='clickhouse',
         address='..',
         user='..',
         password='..',
         database='..',
         secure=true|false,
         table='..';

The required settings are type and address. For other settings, the default values are

'default' for user
'' (empty string) for password
'default' for database
'false' for secure
If you omit the table name, it will use the name of the external table

You don't need to specify the columns, since the table schema will be fetched from the ClickHouse server.

Once the external table is created successfully, you can run the following SQL to list the columns:

DESCRIBE name

info

The data types in the output will be Proton data types, such as uint8, instead of ClickHouse type UInt8. Proton maintains a mapping for those types. Learn more.

You can define the external table and use it to read data from the ClickHouse table, or write to it.

CREATE EXTERNAL TABLE

Syntax​

Syntax