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ClickHouse/docs/en/system_tables/system.tables.md
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system.tables

This table contains the String columns 'database', 'name', and 'engine'. Also, the table has three virtual columns: metadata_modification_time of type DateTime, create_table_query and engine_full of type String. Each table that the server knows about is entered in the 'system.tables' table. This system table is used for implementing SHOW TABLES queries.