ClickHouse/doc/reference/en/system_tables/system.tables.rst

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system.tables
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This table contains the String columns 'database', 'name', and 'engine' and DateTime column metadata_modification_time.
Each table that the server knows about is entered in the 'system.tables' table.
There is an issue: table engines are specified without parameters.
This system table is used for implementing SHOW TABLES queries.