ClickHouse/docs/en/system_tables/system.one.rst

system.one
----------

This table contains a single row with a single 'dummy' UInt8 column containing the value 0.
This table is used if a SELECT query doesn't specify the FROM clause.
This is similar to the DUAL table found in other DBMSs.
Initial commit if EN docs 2017-04-03 19:49:50 +00:00			`system.one`
			`----------`

System tables 2017-04-26 17:37:55 +00:00			`This table contains a single row with a single 'dummy' UInt8 column containing the value 0.`
			`This table is used if a SELECT query doesn't specify the FROM clause.`
			`This is similar to the DUAL table found in other DBMSs.`