ClickHouse/docs/en/system_tables/system.one.md
2018-03-25 05:04:22 +03:00

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# 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.