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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 does not specify the FROM clause.

This is similar to the DUAL table found in other DBMSs.

Example

:) SELECT * FROM system.one LIMIT 10;
┌─dummy─┐
│ 0 │
└───────┘

1 rows in set. Elapsed: 0.001 sec.

Original article