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36 lines
2.9 KiB
Markdown
36 lines
2.9 KiB
Markdown
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# system.table\_engines {#system-table-engines}
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Contains description of table engines supported by server and their feature support information.
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This table contains the following columns (the column type is shown in brackets):
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- `name` (String) — The name of table engine.
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- `supports_settings` (UInt8) — Flag that indicates if table engine supports `SETTINGS` clause.
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- `supports_skipping_indices` (UInt8) — Flag that indicates if table engine supports [skipping indices](../../engines/table-engines/mergetree-family/mergetree.md#table_engine-mergetree-data_skipping-indexes).
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- `supports_ttl` (UInt8) — Flag that indicates if table engine supports [TTL](../../engines/table-engines/mergetree-family/mergetree.md#table_engine-mergetree-ttl).
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- `supports_sort_order` (UInt8) — Flag that indicates if table engine supports clauses `PARTITION_BY`, `PRIMARY_KEY`, `ORDER_BY` and `SAMPLE_BY`.
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- `supports_replication` (UInt8) — Flag that indicates if table engine supports [data replication](../../engines/table-engines/mergetree-family/replication.md).
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- `supports_duduplication` (UInt8) — Flag that indicates if table engine supports data deduplication.
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Example:
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``` sql
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SELECT *
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FROM system.table_engines
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WHERE name in ('Kafka', 'MergeTree', 'ReplicatedCollapsingMergeTree')
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```
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``` text
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┌─name──────────────────────────┬─supports_settings─┬─supports_skipping_indices─┬─supports_sort_order─┬─supports_ttl─┬─supports_replication─┬─supports_deduplication─┐
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│ Kafka │ 1 │ 0 │ 0 │ 0 │ 0 │ 0 │
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│ MergeTree │ 1 │ 1 │ 1 │ 1 │ 0 │ 0 │
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│ ReplicatedCollapsingMergeTree │ 1 │ 1 │ 1 │ 1 │ 1 │ 1 │
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└───────────────────────────────┴───────────────────┴───────────────────────────┴─────────────────────┴──────────────┴──────────────────────┴────────────────────────┘
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```
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**See also**
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- MergeTree family [query clauses](../../engines/table-engines/mergetree-family/mergetree.md#mergetree-query-clauses)
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- Kafka [settings](../../engines/table-engines/integrations/kafka.md#table_engine-kafka-creating-a-table)
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- Join [settings](../../engines/table-engines/special/join.md#join-limitations-and-settings)
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