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ClickHouse/docs/en/system_tables/system.one.md
BayoNet 13d9a4eebe Sources for english documentation switched to Markdown. 
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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.